utils/textimport: Remove 'exclusive' kwarg from QActionGroup call

In Qt 5.14 'exclusive' is no longer a Q_PROPERTY of QActionGroup

Author: ales-erjavec

Orange/widgets/utils/textimport.py

@@ -1108,7 +1108,7 @@ def __run_type_columns_menu(self, pos, columns):
         else:
             current = None
         cb = self.column_type_edit_cb
-        g = QActionGroup(menu, exclusive=True)
+        g = QActionGroup(menu)
         current_action = None
         # 'Copy' the column types model into a menu
         for i in range(cb.count()):