add new line at the end of the file

Author: arash-e-at-moz

tests/tabs/test_ungroup_tabs.py

@@ -82,4 +82,4 @@ def test_ungroup_tabs(driver: Firefox):
     tabs.actions.click_and_hold(first_tab).move_by_offset(120, 0).release().perform()
 
     # Verify tab is removed from the tab group
-    tabs.element_not_visible("tabgroup-overflow-count")
+    tabs.element_not_visible("tabgroup-overflow-count")