Fix linting errors

Author: tcbegley

docs/demos/__init__.py

@@ -1,4 +1,5 @@
 import os
+
 import dash
 import dash_bootstrap_components as dbc
 

docs/demos/theme_explorer/__init__.py

@@ -113,17 +113,5 @@ def open_toast(_):
     return True
 
 
-@app.callback(
-    Output("gallery_checklist1", "value"),
-    Output("gallery_radio1", "value"),
-    Output("gallery_checklist2", "value"),
-    Output("gallery_radio2", "value"),
-    Input("gallery_checklist1", "value"),
-)
-def update_checklist(value):
-    # This is a dummy callback so checkboxes change color when theme is switched
-    return value, 0, value, 0
-
-
 if __name__ == "__main__":
     app.run_server(debug=True)