Fix logcat assertion in BackupWakelockHostSideTest

The test is currently looking for an incorrect string in the logcat to assert that device wakelock was released after the restore operation. Update the string.

Bug: 247557468, 249808834
Change-Id: I50918563a842c2772cca9d8992c750bb2e04d933
(cherry picked from commit 90ceb1623cf564808562e6c92824d8ed410fe922)