Filter instant apps with different names

ag/2447596 introduced a regression that caused instant apps to be
made visible to one another.

Change-Id: I5db9a43f05dd5bec991cc0934b1c9a9406dfade6
Fixes: 62998487
Test: cts-tradefed run commandAndExit cts-dev -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.EphemeralTest