Re-enable the MediaStore_Images_ThumbnailsTest test in pre-submit.

Bug: 139535570
Test: Forrest - L82300000372905885
Change-Id: Ibbc999f4bf092eeea8718b3842c03113dfcb3ded
Merged-In: I7f3a4b47235ab9d65c0e0ae5979b7c5774d44f54
Exempt-From-Owner-Approval: Re-enabling known working test in TEST_MAPPING
for aosp-master.
1 file changed