replace singleplayer with Sam

mods/HUD/mcl_credits/init.lua

@@ -189,9 +189,13 @@ function mcl_credits.show(player)
 		end
 		for _, tname in ipairs(group[3]) do
 			y = y + 25
+			local spname = name
+			if minetest.is_singleplayer() then
+				spname = "Sam"
+			end
 			add_hud_element({
 				hud_elem_type = "text",
-				text = tname:format(name),
+				text = tname:format(spname),
 				number = 0xFFFFFF,
 				scale = {x = 1, y = 1},
 			}, huds, y, 0)