[ticket/13146] Allow changing the result of calling get_forums_visibility_sql

PHPBB3-13146
[ticket/13146] Adding $content_replaced to allow even more flexibility

PHPBB3-13146
[ticket/13147] Adding $approve_forums to the list of the event's variables

PHPBB3-13147
[ticket/13146] Typo on the returning variable

PHPBB3-13146
[ticket/13146] $phpbb_dispatcher was missing

Added $phpbb_dispatcher to the globals list for this function.

PHPBB3-13146
[ticket/13146] Extra line for clarity

Added an extra line after the "if ($contentReplaced)"  to help reading the code

PHPBB3-13146
[ticket/13146] $contentReplaced -> $content_replaced

PHPBB3-13146
[ticket/13146] Adding eventDispatcher to the list

PHPBB3-13146
[ticket/13146] Fixing what merging broke

Merging added content I didn't expect it to add. This fixes back to what it is supposed to be.

PHPBB3-13146
[ticket/13146] Wrong usage of tabs in .yml

PHPBB3-13146