More bug fixes

Author: RodZill4

material_maker/tools/environment_manager/environment_manager.gd

@@ -218,6 +218,7 @@ func new_environment(index : int) -> void:
 
 func delete_environment(index : int) -> void:
 	environments.remove(index)
+	environment_textures.remove(index)
 
 var thumbnail_update_list = []
 var rendering = false

material_maker/windows/environment_editor/environment_editor.gd

@@ -176,7 +176,7 @@ func _on_Share_pressed():
 	var preview_texture : ImageTexture = ImageTexture.new()
 	preview_texture.create_from_image(image)
 	var env = environment_manager.get_environment(current_environment).duplicate()
-	env.remove("thumbnail")
+	env.erase("thumbnail")
 	share_button.send_asset("environment", env, preview_texture)