Update bluray.c. Reinstate handbrake support of -i /dev/disk3 mount points vs needing to know the mount point and giving it to -i

To re-instate the functionality that allowed handbrake to accept: -i /dev/disk3 vs -i /Volumes/MountPointName

The 1.2.x tree supported this method of pointing to /dev/disk3 but as of 1.3 that function is gone. I believe that was in error rather than by design.