[unrelated] fix Alloy repo

The repo URL for "Alloy_by-lausdahl" has gone bad since the last time the UDL checker was run.

Since this is blocking PL/I from being added, @pryrt is adding it to this PR (though the fix really should have been in a separate PR)

Author: pryrt

udl-list.json

@@ -80,7 +80,7 @@
             "id-name": "Alloy_by-lausdahl",
             "display-name": "Alloy",
             "version": "Thu, 27 Dec 2012 05:53:49 GMT",
-            "repository": "http://lausdahl.users.sourceforge.net/Notepadpp_Alloy_language_style.zip",
+            "repository": "",
             "description": "Alloy",
             "author": "lausdahl <mailto:lausdahl@users.sourceforge.net>"
         },