[ticket/11558] Fix styling for notifications link

PHPBB3-11558
[ticket/11558] Adjustments for notification link

PHPBB3-11558
Merge remote-tracking branch 'remotes/cyberalien/ticket/11558' into develop

# By Vjacheslav Trushkin
# Via Vjacheslav Trushkin
* remotes/cyberalien/ticket/11558:
  [ticket/11558] Adjustments for notification link
  [ticket/11558] Fix styling for notifications link