profiles: anki: allow lua

Anki uses mpv to play media, which requires the lua interpreter.

Without this, anki displays this error in the console and falls back to
mplayer:

    mpv: error while loading shared libraries: libluajit-5.1.so.2: cannot open shared object file: Permission denied
    Traceback (most recent call last):
    File "/usr/lib/python3.12/site-packages/aqt/sound.py", line 854, in setup_audio
    mpvManager = MpvManager(base_folder, media_folder)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/usr/lib/python3.12/site-packages/aqt/sound.py", line 408, in __init__
    super().__init__(window_id=None, debug=False)
    File "/usr/lib/python3.12/site-packages/aqt/mpv.py", line 442, in __init__
    super().__init__(*args, **kwargs)
    File "/usr/lib/python3.12/site-packages/aqt/mpv.py", line 104, in __init__
    self._start_socket()
    File "/usr/lib/python3.12/site-packages/aqt/mpv.py", line 194, in _start_socket
    raise MPVProcessError("unable to start process")
    aqt.mpv.MPVProcessError: unable to start process

    mpv too old or failed to open, reverting to mplayer

etc/profile-a-l/anki.profile

@@ -6,11 +6,18 @@ include anki.local
 # Persistent global definitions
 include globals.local
 
+# Add the following to anki.local if you don't need media playing/recording
+# (lua is needed by mpv):
+#ignore include allow-lua.inc
+
 noblacklist ${DOCUMENTS}
 noblacklist ${HOME}/.config/mpv
 noblacklist ${HOME}/.local/share/Anki2
 noblacklist ${HOME}/.mplayer
 
+# Allow lua (blacklisted by disable-interpreters.inc)
+include allow-lua.inc
+
 # Allow python (blacklisted by disable-interpreters.inc)
 include allow-python2.inc
 include allow-python3.inc