message: parse stanzaid in MUC case

There was a todo for this in message.c which got forgotten.

This was most likely also the reason why there were NULL entries for
this in the DB which DebXWoody mentioned in the MUC.

Thus comparison was with NULL and no new entries were added to the
database.

Edit:
After checking pull requests I see Stefans draft PR:
https://github.com/profanity-im/profanity/pull/1505

So let's add him as co-author.

Co-authored-by: Stefan Kropp <stefan@debxwoody.de>

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