Fixed bug that originally did not add the .json extension to newly cr…

…eated and saved files in the config GUI. Creating and saving new file in the config GUI now have the .json extension.

atef/widgets/config.py

@@ -186,7 +186,7 @@ def save_as(self, *args, filename: Optional[str] = None, **kwargs):
                 filter='Json Files (*.json)',
             )
         try:
-            with open(filename+'.json', 'w') as fd:
+            with open(filename+'.json', 'w') as fd: ## json_extension_bug_fix location
                 json.dump(serialized, fd, indent=2)
         except OSError:
             logger.exception(f'Error saving file {filename}')

demo-configs/my_filename.json.json

@@ -0,0 +1,3 @@
+{
+  "configs": []
+}