[ticket/12063] Remove obsolete valign attributes from tr tags

PHPBB3-12063
[ticket/12063] Use CSS to replace valign=top

PHPBB3-12063
Merge remote-tracking branch 'vsephpbb/ticket/12063' into develop

* vsephpbb/ticket/12063:
  [ticket/12063] Use CSS to replace valign=top
  [ticket/12063] Remove obsolete valign attributes from tr tags