GAIAMNGT-1700 Fix code style issues

Author: Jorge Fernandez Hernandez

astroquery/gaia/core.py

@@ -328,7 +328,7 @@ def build_general_output_filename(self):
         now_formatted = now.strftime("%Y%m%d_%H%M%S")
         temp_dirname = "temp_" + now_formatted
         downloadname_formated = "download_" + now_formatted
-        return  os.path.join(os.getcwd(), temp_dirname, downloadname_formated)
+        return os.path.join(os.getcwd(), temp_dirname, downloadname_formated)
 
     @staticmethod
     def __get_data_files(output_file, path):

astroquery/gaia/tests/test_gaiatap.py

@@ -802,8 +802,7 @@ def test_datalink_querier_load_data_vot_exception(mock_datalink_querier, overwri
 
         assert str(
             excinfo.value) == (
-                   f"{file_final} file already exists. Please use overwrite_output_file='True' to overwrite "
-                   f"output file.")
+            f"{file_final} file already exists. Please use overwrite_output_file='True' to overwrite output file.")
 
     else:
         mock_datalink_querier.load_data(ids=[5937083312263887616], data_release='Gaia DR3',