Properly insert series back into dataframe

This fixes it adding that extra column.

Author: ssweber

pysimplesql/pysimplesql.py

@@ -1693,7 +1693,7 @@ def save_record(
             current_row[self.pk_column] = pk
 
             # then update the current row data
-            self.rows[self.current_index] = current_row
+            self.rows.iloc[self.current_index] = current_row
 
             # If child changes parent, move index back and requery/requery_dependents
             if (