Remove assumption about 'external' volume

Remove assumption that will fail for 'external' parameter.

The tests should now handle any volume fine anyway.

BUG: 159197779
Test: atest MediaStore_Images_MediaTest#testUpsert
Test: atest MediaStore_Images_MediaTest#testUpdateAndReplace
Change-Id: I7c5ab7d2b1f443a8886e594b56a37b9e1da9fee0
Merged-In: I7c5ab7d2b1f443a8886e594b56a37b9e1da9fee0
(cherry picked from commit 5da97d044e64a811706cbd0d1b81bf442d369795)
1 file changed