Skip checking if a broadcastreceiver was already registered

If AppRestoreButton decides to dispose DisposableBroadcastReceiverAsUser
while recomposition, the broadcast receiver will be unregistered. If
this happens, there will be no visual feedback while restoring the app.
Thus, always render the DisposableBroadcastReceiverAsUser composable at
each recomposition of AppRestoreButton.

Since DisposableBroadcastReceiverAsUser uses `LaunchedEffect`, it wont
register a broadcast receiver at every recomposition.

Bug: 391744608
Test: atest SettingsSpaUnitTests
Flag: EXEMPT. Bug fix only
Change-Id: I420f95da363cf4da1a48150d32aec763c9159a1c