auth: fix forum link in motd; closes #1363

(cherry picked from commit 168393a4)

src/opnsense/service/templates/OPNsense/Auth/motd.in

@@ -3,7 +3,7 @@
 |                                            |        @@@@         @@@@
 | Website:	https://opnsense.org/        |         @@@\\\   ///@@@
 | Handbook:	https://docs.opnsense.org/   |       ))))))))   ((((((((
-| Forums:	https://forums.opnsense.org/ |         @@@///   \\\@@@
+| Forums:	https://forum.opnsense.org/  |         @@@///   \\\@@@
 | Lists:	https://lists.opnsense.org/  |        @@@@         @@@@
 | Code:		https://github.com/opnsense  |         @@@@@@@@@@@@@@@
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