Fix metadata row delete before secondary load

Author: mrvisscher

activity_browser/bwutils/metadata/loader.py

@@ -95,7 +95,7 @@ def secondary_load_database(self, secondary_df: pd.DataFrame, sqlite_db: str):
             return
 
         database = secondary_df.index[0][0]
-        indices = self.mds.dataframe.loc[database].index
+        indices = self.mds.dataframe.loc[[database]].index
 
         if not all(secondary_df.index.isin(indices)):
             log.debug("Secondary database metadata dropping rows")