Instantly excute next state when the agent provides a prohibited key.

When the agent provides a prohibited key, the code flow will directly be returned
without excuting next backup state. The next state should be execute instantly to
make sure the backup mechanism can be executed properly.

Bug: 77272601
Test: 1.m -j RunFrameworksServicesRoboTests
      2.Manual testing by test package with prohibited key.
      - adb backup -all
      - adb backup -shared
      - adb backup -obb -all
      - adb shell bmgr backupnow --all
      - adb shell bmgr backupnow [test key value package]
      - adb backup -keyvalue [test key value package]
Change-Id: I46e1aa8dd0f75cf54087b43cee50ee952d85abc1