Ignore uninstall failures in exopackage_test_single.sh
Ignore uninstall failures in exopackage_test_single.sh

Summary:
On some android/adb versions, uninstall will fail if the app isn't
installed. We don't really care if uninstall fails, and it's easiest to
just ignore it. This script is only manually run and so if it causes
issues we'll deal with it then.

Reviewed By: jeffdunn

fbshipit-source-id: 8921297ce5

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