Tests: Use `assertSame()` in `WP_Customize_Nav_Menu_Item_Setting` tests. #3182

Job	Run time
JavaScript type checking / Run JavaScript type checking	42s
Slack Notifications / Prepare notifications	7s
Slack Notifications / Success notifications	5s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Failure notifications	0s
Failed workflow tasks	0s
	54s

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