Fix one of DatabaseHelperTest to verify downgrade from T to S

Bug: 214354131
Test: atest packages/providers/MediaProvider/tests/src/com/android/providers/media/DatabaseHelperTest.java
Change-Id: I85bdccd81ef2ee9023a5edaf94aca55bebb29844
(cherry picked from commit 44be4b1b88ea791a8ce335bc742df857bbadf73c)
1 file changed