MtpDatabase: Use actual file size instead of media database size column

Fixes problems with file transfer from device to host that can occur
if the database size value is wrong.

Bug: 6954446

Change-Id: I03c3dd4b75267d1f4613f0b588c8899ded9a70be
Signed-off-by: Mike Lockwood <lockwood@google.com>
2 files changed