Fix AuthenticationCallback leak in FingerprintManager

Fixes: 32295793

Test: 1) modify/build/run apk attached in BR
2) run garbage collection after FingerprintActivity is done
3) use HPROF, FingerprintActivity should have "0 total count"
4) do this test for auth success, auth fail, auth cancel

Change-Id: I5fe7937a26d4673226b87c9c95a136dd9510e21f