Make zombies and skeletons not float (#4512)

Reviewed-on: VoxeLibre/VoxeLibre#4512
Reviewed-by: the-real-herowl <the-real-herowl@noreply.git.minetest.land>
Co-authored-by: kno10 <erich.schubert@gmail.com>
Co-committed-by: kno10 <erich.schubert@gmail.com>

mods/ENTITIES/mobs_mc/skeleton+stray.lua

@@ -103,6 +103,7 @@ local skeleton = {
 		return true
 	end,
 	ignited_by_sunlight = true,
+	floats = 0,
 	view_range = 16,
 	fear_height = 4,
 	attack_type = "dogshoot",

mods/ENTITIES/mobs_mc/skeleton_wither.lua

@@ -94,6 +94,7 @@ mcl_mobs.register_mob("mobs_mc:witherskeleton", {
 	dogshoot_switch = 1,
 	dogshoot_count_max =0.5,
 	fear_height = 4,
+	floats = 0,
 	harmed_by_heal = true,
 	fire_resistant = true,
 	dealt_effect = {

mods/ENTITIES/mobs_mc/villager_zombie.lua

@@ -134,6 +134,7 @@ mcl_mobs.register_mob("mobs_mc:villager_zombie", {
 	end,
 	sunlight_damage = 2,
 	ignited_by_sunlight = true,
+	floats = 0,
 	view_range = 16,
 	fear_height = 4,
 	harmed_by_heal = true,

mods/ENTITIES/mobs_mc/zombie.lua

@@ -96,6 +96,7 @@ local zombie = {
 	},
 	ignited_by_sunlight = true,
 	sunlight_damage = 2,
+	floats = 0,
 	view_range = 16,
 	attack_type = "dogfight",
 	harmed_by_heal = true,