Don't allow ruby 1.8.7 from rvm to be the default, this breaks vagrant provisioning

with-rvm/manifests/base.pp

@@ -34,7 +34,7 @@ node default {
       "$ruby_18" :
         ensure => "present",
         require => Exec["system-rvm"],
-        default_use => true;
+        default_use => false;
     }
   }
 }