Fix testVisitUris_styleExtrasWithoutStyle

Turns out that Style.addExtras() also populates EXTRA_TEMPLATE, so this unit test wasn't verifying that visitUris processed the CallStyle fields when CallStyle is not set. Luckily, it was verifying the MessagingStyle part of the extras correctly, so it was only half broken. ¯\_(ツ)_/¯

Fixes: 297027668
Test: atest NotificationManagerServiceTest
Change-Id: If852bb910d57702082ac006b8dccdc232a03b7e9