Flexiglass: Fix QSHeader scenario tests

Apply test tags to the new view so that the scenario test can retrieve
the correct battery UI when flexiglass is enabled.

Bug: 409043418
Test: QSHeaderBatteryVisible, QSHeaderAfterRotationTest
Flag: com.android.systemui.scene_container
Change-Id: I428c5eba9b3c52eac3fe52a7964a6c1b7cffb503