Fix userid bug in AppStartInfo

I was struggling to get results from
getExternalHistoricalProcessStartReasons when called from a test until I
noticed that the uid output from enforceDumpPermissionForPackage was not
actually being used in the subsequent call to getStartInfo.

After making this change I was able to successfully run the test.

Bug: 247814855
Test: locally using atest

Change-Id: I85b0bf8133da54dd9f20891a49e17d353cfa87f8