Use the latest 'uses-sdk' tag to detect target SDK version.

At the moment aapt2 dumps information from the latest <uses-sdk> element
but uses all of them to detect target SDK which affects implied
permissions. Use only the latest one for detecting targetSdk as well.

Bug: b/243145989
Test: Dump_test
Change-Id: I70f828f1845ab070fa84c5297af12df24e7068dc