Fix name of gnus-notification(s)-close; ignore argument

* lisp/gnus/gnus-notifications.el (gnus-notifications-close): Original
name was probably a typo.
1 job for master in 5 minutes and 2 seconds (queued for 37 seconds)
Status Job ID Name Coverage
  Normal
failed #82494
test-lisp-gnus-inotify

00:05:02

 
Name Stage Failure
failed
test-lisp-gnus-inotify Normal
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Cleaning up project directory and file based variables
ERROR: Job failed: exit code 123