Replace legacy StorageManager check

Replace the legacy check with a MANAGE_EXTERNAL_STORAGE check, which
is the expected behaviour and consistant with the doc.

Flag: NA (very small fix, easy to revert and does't need dogfood)
Test: presubmit
Bug: 341974583
Change-Id: I4e3f270240e818c6996d9f4c27eb78874e1b7b0b
1 file changed