only return keepers in zmask dataframe

extensions/chaeo/workflows.py

@@ -213,7 +213,7 @@ def export_patches_from_multichannel_zstack(
         'pixeL_scale_in_micrometers': stack.pixel_scale_in_micrometers,
         'success': True,
         'timer_results': ti.events,
-        'dataframe': df,
+        'dataframe': df[df['keeper'] == True],
         'interm': interm,
     }