text/x-qml: Lower match priority to avoid conflicts with Python

GLib takes priorities >= 80 to mean a short-circuit to a magic
match, overriding any conflicting matching globs. More generally, high
priority magic should only be used if it’s really unlikely that the
magic will match anything except the given MIME type. That’s evidently
not true here.

Some Python files which import Qt modules can look like valid QML
files, matching the magic but not the glob.

Lower the priority of the magic so that it doesn’t trigger the
short-circuit code in GLib. This means the name match is guessed as the
right one instead of the magic match.

See
https://gitlab.gnome.org/GNOME/glib/-/blob/6ee71750a532d8de5eaed5cf12e8718738ddd5c6/gio/gcontenttype.c#L840
and https://gitlab.gnome.org/GNOME/glib/-/issues/2599.

Tested with `XDG_DATA_DIRS=$buildroot/share gio info ./not-qml.py`.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Helps: #84
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