discourse: Make sure the notification email setting applies

Discourse normally overrides the default notification email setting,
which makes the `notificationEmailAddress` setting ineffective. Add a
patch to remove this override.

Fixes #140114.

(cherry picked from commit 917a0cfe47bad420a894fe8ca35d7dd95ebb5a7c)

pkgs/servers/web-apps/discourse/default.nix

@@ -262,6 +262,9 @@ let
       # defaults to the plugin's directory and isn't writable at the
       # time of asset generation
       ./auto_generated_path.patch
+
+      # Make sure the notification email setting applies
+      ./notification_email.patch
     ];
 
     postPatch = ''