talkatu/talkatu

Remove the ui file for messages actions which was removed awhile ago
gtk4
2022-01-30, Gary Kramlich
f22ae6964431
Remove the ui file for messages actions which was removed awhile ago

Testing Done:
ran `ninja talkatu/talkaturesources.h talkatu/talkaturesources.c`

Reviewed at https://reviews.imfreedom.org/r/1258/
Talkatu is versioned in [mercurial](https://www.mercurial-scm.org/) and is
available on [keep.imfreedom.org](https://keep.imfreedom.org/talkatu/talkatu).
All contributions are provided via review requests at [reviews.imfreedom.org](https://reviews.imfreedom.org/).