[#61] pep8 correction

leobject/datasources/ledatasourcesql.py

                 where_filters[relational_where_filters_key] = relational_where_filters_value
 
             # Building the query
-            query = select(query_table_name, where=where_filters, select=field_list, joins = join(self.RELATIONS_TABLE_NAME, join_fields))
+            query = select(query_table_name, where=where_filters, select=field_list, joins=join(self.RELATIONS_TABLE_NAME, join_fields))
         else:
             query = select(query_table_name, where=where_filters, select=field_list)