Fix more Christoph(er) mixups

Co-authored-by: Christoph Wurst <ChristophWurst@users.noreply.github.com>
Signed-off-by: Joas Schilling <213943+nickvergessen@users.noreply.github.com>

Author: nickvergessen

.github/CODEOWNERS

@@ -1,7 +1,7 @@
 # App maintainers
 /apps/admin_audit/appinfo/info.xml            @luka-nextcloud @blizzz
 /apps/cloud_federation_api/appinfo/info.xml   @vitormattos @mejo-
-/apps/comments/appinfo/info.xml               @marcelklehr @ChristophWurst
+/apps/comments/appinfo/info.xml               @marcelklehr @Pytal
 /apps/contactsinteraction/appinfo/info.xml    @kesselb @miaulalala @Pytal @GretaD @hamza221 @st3iny
 /apps/dashboard/appinfo/info.xml              @julien-nc @juliushaertl
 /apps/dav/lib/CalDAV                          @ChristophWurst @miaulalala @tcitworld