Also apply prefix when dumping isAllowedToUseHiddenApi

This is a follow up CL to a CL [1] that added one more state dump from
ApplicationInfo regarding whether the app is exampted from the API
restriction but forgot to take care of prefix handling.

 [1]: I01e837253d00c6ffa841a9e5c226204a3e11b827
      974290b0

Bug: 64382372
Test: Ran the following command to see "isAllowedToUseHiddenApi"
      is aligned with other outputs from ApplicationInfo.
         adb shell ime list -a
Change-Id: I9c77d9b557245b7f3b51631140bd564feef601ce