[ticket/11360] Change second parameter in page_header function

PHPBB3-11360
[ticket/11360] Avoiding online list where not required

PHPBB3-11360
[ticket/11360] Updating default value of $display_online_list

PHPBB3-11360
Merge remote-tracking branch 'geetakshi/ticket/11360' into develop-ascraeus

* geetakshi/ticket/11360:
  [ticket/11360] Updating default value of $display_online_list
  [ticket/11360] Avoiding online list where not required
  [ticket/11360] Change second parameter in page_header function