[PHPBB3-9512] Fix dead link in MCP on reports for global announcements in prosilver.

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in the MCP > Reported Messages > Open/Closed Reports
when there is a report on a global announcement, there is a empty link:

'U_VIEWFORUM'				=> (!$global_topic) ? append_sid("{$phpbb_root_path}viewforum.$phpEx", 'f=' . $row['forum_id']) : '',

and

{L_FORUM}: <a href="{postrow.U_VIEWFORUM}">{postrow.FORUM_NAME}</a>

resulting in

Forum: <a href="">Global announcement</a>

Suggested fix makes it work like subsilver2 and just views

Global announcement