feat(specs): Remove default value from url_filtering_sec_profile vari…

…ants

XML schema provides default values for some variants (mostly strings) and that
gets translated into a terraform attribute that always have a value, breaking
server-side validation.

specs/objects/profiles/url-filtering.yaml

@@ -242,8 +242,7 @@ spec:
             - type: length
               spec:
                 max: 31
-            spec:
-              default: any
+            spec: {}
             description: Use Group Mapping
             required: false
           - name: ip-user