Editor: Remove unused Class Name field from Create Script dialog

modules/gdscript/editor/script_templates/EditorScenePostImport/basic_import_script.gd

@@ -1,6 +1,7 @@
 # meta-description: Basic import script template
+
 @tool
-extends EditorScenePostImport
+extends _BASE_
 
 
 # Called by the editor when a scene has this script set as the import script in the import tab.

modules/gdscript/editor/script_templates/EditorScenePostImport/no_comments.gd

@@ -1,6 +1,7 @@
 # meta-description: Basic import script template (no comments)
+
 @tool
-extends EditorScenePostImport
+extends _BASE_
 
 
 func _post_import(scene: Node) -> Object: