Profiles: anki: allow mpv and mplayer

Anki relies on mpv and mplayer for playing audio and video files.

If mpv is present in the system but not allowed in firejail then
Anki fails to start because mpv permissions won't allow for execution.

Fixes #6544.

etc/profile-a-l/anki.profile

@@ -46,7 +46,7 @@ protocol unix,inet,inet6
 seccomp !chroot
 
 disable-mnt
-private-bin anki,python*
+private-bin anki,mplayer,mpv,python*
 private-cache
 private-dev
 private-etc @tls-ca,@x11