Clear auto select sub correctly

When requested validation, if the requested sub is already the preferred sub, also make sure to clear auto select sub Id before short-circuit to successful callback.

Fix: 327468739
Test: basic voice + data browsing
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:744eb0e52ed2545a2f592e26cd8a8977db9b3536)
Merged-In: I89e885779b53d57679fc220867b08e65eae26bea
Change-Id: I89e885779b53d57679fc220867b08e65eae26bea
2 files changed