fix gradio themes not applying

modules/shared_gradio_themes.py

@@ -59,8 +59,8 @@ def reload_gradio_theme(theme_name=None):
                 shared.gradio_theme = gr.themes.ThemeClass.load(theme_cache_path)
             else:
                 os.makedirs(theme_cache_dir, exist_ok=True)
-                gradio_theme = gr.themes.ThemeClass.from_hub(theme_name)
-                gradio_theme.dump(theme_cache_path)
+                shared.gradio_theme = gr.themes.ThemeClass.from_hub(theme_name)
+                shared.gradio_theme.dump(theme_cache_path)
         except Exception as e:
             errors.display(e, "changing gradio theme")
             shared.gradio_theme = gr.themes.Default(**default_theme_args)