[ticket/11395] Prevent acp_modules::get_modules_info from reincluding files

PHPBB3-11395
Merge remote-tracking branch 'EXreaction/ticket/11395' into develop

# By Nathaniel Guse
# Via Nathaniel Guse
* EXreaction/ticket/11395:
  [ticket/11395] Prevent acp_modules::get_modules_info from reincluding files