Removed divider row from tab completion hint table

Author: kmvanbrunt

cmd2/argparse_completer.py

@@ -494,7 +494,7 @@ def _format_completions(self, action, completions: List[Union[str, CompletionIte
             cols.append(Column(destination.upper(), width=token_width))
             cols.append(Column(desc_header, width=desc_width))
 
-            hint_table = SimpleTable(cols)
+            hint_table = SimpleTable(cols, divider_char=None)
             self._cmd2_app.completion_header = hint_table.generate_header()
             self._cmd2_app.display_matches = [hint_table.generate_data_row([item, item.description]) for item in completions]