Creative inventory: Make the whole tab button clickable

Previously, only the tab icon was clickable. Clicking next to the icon would
just close the inventory.
The icon is still kept clickable too since that gives a nicer press animation.
I didn't end up using image_button because that resulted in a different image
size and position, even with the exact same coordinates.

mods/HUD/mcl_inventory/creative.lua

@@ -566,8 +566,10 @@ function mcl_inventory.set_creative_formspec(player)
 			bg_img = "crafting_creative_inactive" .. button_bg_postfix[this_tab] .. ".png"
 		end
 		return table.concat({
-			"style[" .. this_tab .. ";border=false;bgimg=;bgimg_pressed=;noclip=true]",
-			"image[" .. offset[this_tab] .. ";1.5,1.44;" .. bg_img .. "]",
+			"style[" .. this_tab ..       ";border=false;noclip=true;bgimg=;bgimg_pressed=]",
+			"style[" .. this_tab .. "_outer;border=false;noclip=true;bgimg=" .. bg_img ..
+				";bgimg_pressed=" .. bg_img .. "]",
+			"button[" .. offset[this_tab] .. ";1.5,1.44;" .. this_tab .. "_outer;]",
 			"item_image_button[" .. boffset[this_tab] .. ";1,1;" .. tab_icon[this_tab] .. ";" .. this_tab .. ";]",
 		})
 	end
@@ -581,8 +583,6 @@ function mcl_inventory.set_creative_formspec(player)
 		"formspec_version[6]",
 		"size[13,8.75]",
 
-		"style_type[image;noclip=true]",
-
 		-- Hotbar
 		mcl_formspec.get_itemslot_bg_v4(0.375, 7.375, 9, 1),
 		"list[current_player;main;0.375,7.375;9,1;]",
@@ -655,54 +655,54 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 
 	local name = player:get_player_name()
 
-	if fields.blocks then
+	if fields.blocks or fields.blocks_outer then
 		if players[name].page == "blocks" then return end
 		set_inv_page("blocks", player)
 		page = "blocks"
-	elseif fields.deco then
+	elseif fields.deco or fields.deco_outer then
 		if players[name].page == "deco" then return end
 		set_inv_page("deco", player)
 		page = "deco"
-	elseif fields.redstone then
+	elseif fields.redstone or fields.redstone_outer then
 		if players[name].page == "redstone" then return end
 		set_inv_page("redstone", player)
 		page = "redstone"
-	elseif fields.rail then
+	elseif fields.rail or fields.rail_outer then
 		if players[name].page == "rail" then return end
 		set_inv_page("rail", player)
 		page = "rail"
-	elseif fields.misc then
+	elseif fields.misc or fields.misc_outer then
 		if players[name].page == "misc" then return end
 		set_inv_page("misc", player)
 		page = "misc"
-	elseif fields.nix then
+	elseif fields.nix or fields.nix_outer then
 		set_inv_page("all", player)
 		page = "nix"
-	elseif fields.food then
+	elseif fields.food or fields.food_outer then
 		if players[name].page == "food" then return end
 		set_inv_page("food", player)
 		page = "food"
-	elseif fields.tools then
+	elseif fields.tools or fields.tools_outer then
 		if players[name].page == "tools" then return end
 		set_inv_page("tools", player)
 		page = "tools"
-	elseif fields.combat then
+	elseif fields.combat or fields.combat_outer then
 		if players[name].page == "combat" then return end
 		set_inv_page("combat", player)
 		page = "combat"
-	elseif fields.mobs then
+	elseif fields.mobs or fields.mobs_outer then
 		if players[name].page == "mobs" then return end
 		set_inv_page("mobs", player)
 		page = "mobs"
-	elseif fields.brew then
+	elseif fields.brew or fields.brew_outer then
 		if players[name].page == "brew" then return end
 		set_inv_page("brew", player)
 		page = "brew"
-	elseif fields.matr then
+	elseif fields.matr or fields.matr_outer  then
 		if players[name].page == "matr" then return end
 		set_inv_page("matr", player)
 		page = "matr"
-	elseif fields.inv then
+	elseif fields.inv or fields.inv_outer then
 		if players[name].page == "inv" then return end
 		page = "inv"
 	elseif fields.search == "" and not fields.creative_next and not fields.creative_prev then