[ticket/11653] generate_text_for_display on mcp/mcp_topic.php

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11653
[ticket/11653] Use $parse_flags

sub-task of ticket PHPBB3-11635:
find and fix all bypasses of generate_text_for_*

PHPBB3-11653
Merge remote-tracking branch 'brunoais/ticket/11653' into develop

* brunoais/ticket/11653:
  [ticket/11653] Use $parse_flags
  [ticket/11653] generate_text_for_display on mcp/mcp_topic.php