[ticket/13391] subsilver2 poll options must have a setting of 1 when editing a post

PHPBB3-13391
Merge remote-tracking branch 'Prosk8er/ticket/13391' into develop-ascraeus

* Prosk8er/ticket/13391:
  [ticket/13391] subsilver2 poll options must have a setting of 1 when editing a post