Remove useless ',' from media capacity log message.

Signed-off-by: Mark Harvey <markh794@gmail.com>
Fix loading media with write-protect set.

Fix faulty logic where loading of WRITE-PROTECTED media would update
the drive capabilities to load all media of the same type to READ-ONLY

Reference:
http://mhvtl-linux-virtual-tape-library-community-forums.966029.n3.nabble.com/Setting-tape-write-protect-tp2900316p4025268.html

Reported-by: nia
Signed-off-by: Mark Harvey <markh794@gmail.com>