Take voicemail alert position into account for "older" header for NUI Voicemail Tab

The older header must take into account and be offset when there is a voicemail alert being shown.

Bug: 71700117
Test: N/A
PiperOrigin-RevId: 182243160
Change-Id: Ib38ba82e75fedf9a2939078447e4791f5239524c
1 file changed