attempt fixing test_change_datatype failure

Author: ahmedhamidawan

lib/galaxy_test/selenium/test_workflow_editor.py

@@ -760,6 +760,7 @@ def test_change_datatype(self):
         save_button.wait_for_and_click()
         # Will trigger confirmation modal
         self.components.confirm_dialog.ok_button.wait_for_and_click()
+        self.components.confirm_dialog._.wait_for_absent_or_hidden()
         # Make connection valid again
         editor.change_datatype.wait_for_and_click()
         editor.select_datatype_text_search.wait_for_and_send_keys("tabular")