[ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php

PHPBB3-13057
Merge pull request #2944 from Nicofuma/ticket/13057

[ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php

* Nicofuma/ticket/13057:
  [ticket/13057] Add $phpbb_dispatcher to the global in mcp/mcp_report.php