Stabilize order of options in ImageTransformation

If two options match a the one added first is picked instead of a random
one.

Test: cts-tradefed run cts-dev -m CtsAutoFillServiceTestCases
           --test=android.autofillservice.cts.ImageTransformationTest

Change-Id: I17d6b93d406fe6aa70646dd0432091aab0ce55c0