Fix metadata_test to conform with VTS requirements.

/metadata can be ext4 or f2fs, which this test does not reflect.

Bug: 235179552
Bug: 245054536
Test: vts
Change-Id: I586388f1056057308f43d977375cfa9240e285da
Merged-In: I586388f1056057308f43d977375cfa9240e285da
(cherry picked from commit 0cb921fcc4eea3e8e00e57de9ec91fba002f3850)
1 file changed