added new animal inventory textures (thanks sirrobzeroone)

panda.lua

@@ -83,4 +83,4 @@ if minetest.get_modpath("ethereal") then
 	})
 end
 
-mobs:register_egg("mobs_animal:panda", S("Panda"), "wool_green.png", 1)
+mobs:register_egg("mobs_animal:panda", S("Panda"), "mobs_panda_inv.png")

penguin.lua

@@ -70,4 +70,4 @@ mobs:spawn({
 })
 
 
-mobs:register_egg("mobs_animal:penguin", S("Penguin"), "default_snow.png", 1)
+mobs:register_egg("mobs_animal:penguin", S("Penguin"), "mobs_penguin_inv.png")

rat.lua

@@ -79,7 +79,7 @@ mobs:spawn({
 })
 
 
-mobs:register_egg("mobs_animal:rat", S("Rat"), "mobs_rat_inventory.png", 0)
+mobs:register_egg("mobs_animal:rat", S("Rat"), "mobs_rat_inv.png")
 
 
 mobs:alias_mob("mobs:rat", "mobs_animal:rat") -- compatibility

sheep.lua

@@ -196,7 +196,7 @@ for _, col in ipairs(all_colours) do
 		end
 	})
 
-	mobs:register_egg("mobs_animal:sheep_"..col[1], S("@1 Sheep", col[2]), "wool_"..col[1]..".png", 1)
+mobs:register_egg("mobs_animal:sheep_"..col[1], S("@1 Sheep", col[2]), "wool_"..col[1]..".png^mobs_sheep_inv.png")
 
 	-- compatibility
 	mobs:alias_mob("mobs:sheep_" .. col[1], "mobs_animal:sheep_" .. col[1])