Remove test unrelated to this PR

Author: marcus-kruse-gcx

tests/draft4/optional/format.json

@@ -104,11 +104,6 @@
                 "data": "mailto:[email protected]",
                 "valid": true
             },
-            {
-                "description": "an invalid mailto URI",
-                "data": "mailto:John.Doe-example.com",
-                "valid": false
-            },
             {
                 "description": "a valid newsgroup URI",
                 "data": "news:comp.infosystems.www.servers.unix",