Fix transparent content view when opening the shade during bubble fly out

Fix transparent content view issue when opening the shade during bubble
fly out animation. Old codepath uses setHideSensitive to reset the alpha
, which is not preferred because we didn’t change the hideSensitive, but
rely on calling it to reset the alpha.

Fix: 366027702
Flag: com.android.systemui.notification_content_alpha_optimization
Test: SystemUITest
Change-Id: I8b1215b09c44f79b2bd367a41c939e0d65ae17db