fix: remove already declared config option

modules/config.py

@@ -529,12 +529,6 @@ metadata_created_by = get_config_item_or_set_default(
 
 example_inpaint_prompts = [[x] for x in example_inpaint_prompts]
 
-default_black_out_nsfw = get_config_item_or_set_default(
-    key='default_black_out_nsfw',
-    default_value=False,
-    validator=lambda x: isinstance(x, bool),
-    expected_type=bool
-)
 default_inpaint_mask_model = get_config_item_or_set_default(
     key='default_inpaint_mask_model',
     default_value='isnet-general-use',