[ticket/12506] Reposition post-buttons for compact layout

PHPBB3-12506
[ticket/12506] Reposition buttons to make room for "online" banner

PHPBB3-12506
[ticket/12506] Fix responsive profile min-height (no avatar)

PHPBB3-12506
[ticket/12506] Fix search result h3 margin

There are no buttons present, so don't need to do all this stuff.

PHPBB3-12506
Merge remote-tracking branch 'PayBas/ticket/12506' into develop-ascraeus

* PayBas/ticket/12506:
  [ticket/12506] Fix search result h3 margin
  [ticket/12506] Fix responsive profile min-height (no avatar)
  [ticket/12506] Reposition buttons to make room for "online" banner
  [ticket/12506] Reposition post-buttons for compact layout