Fix instant app filter

There were two bugs in the filtration:
1) An instant app could query for activity info in another
   instant app
2) An instant app could query for activity info from a full
   app if the activity was implicitly exposed by having
   a VIEW/BROWSABLE intent filter

Test: atest -it CtsAppSecurityHostTestCases:EphemeralTest#testActivityInfo
Change-Id: I89b2fb661b13b8e8a8abc6f980d9c56eb4d692b7