Set ignore_baseclass_rules to true on URL rewriter component

else it will also check for all basic rules defined in cubicweb, while we only
want to add a single route here.

views.py

@@ -198,6 +198,7 @@ class RegisterLink(basecomponents.HeaderComponent):
 # urls #########################################################################
 
 class RegistrationSimpleReqRewriter(urlrewrite.SimpleReqRewriter):
+    ignore_baseclass_rules = True
     rules = [
         ('/register', dict(vid='registration')),
     ]