moved function to config module

modules/config.py

@@ -151,6 +151,12 @@ def get_config_item_or_set_default(key, default_value, validator, disable_empty_
         return default_value
 
 
+def update_image_extension(value):
+    '''Updating default image extension used for saving output image'''
+    modules.config.default_image_extension = value
+    print(f'[CONFIG] Updated image extension value: {modules.config.default_image_extension}')
+
+
 default_base_model_name = get_config_item_or_set_default(
     key='default_model',
     default_value='juggernautXL_version6Rundiffusion.safetensors',