[ticket/11956] More resposive dropdown fixes

PHPBB3-11956
[ticket/11956] One more dropdown fix

PHPBB3-11956
Merge pull request #1816 from cyberalien/ticket/11956

[ticket/11956] More resposive dropdown fixes
Merge remote-tracking branch 'phpbb-core/develop'

* phpbb-core/develop:
  [ticket/11956] One more dropdown fix
  [ticket/11956] More resposive dropdown fixes