Update ExternalDbFacadeTest to avoid check on id

Updating test methods in ExternalDbFacadeTest to check for media cover
id presence instead of hardcoded id values. Ids can start over from
a large number with id reuse fix, therefore we do not want tests to
rely on any specific value.

Test: atest ExternalDbFacadeTest
Bug: 229956400
Change-Id: Ic1402f1ae969c240cb3fc2b7d91d51ffac3daff2
1 file changed