cleaning up forgotten debug help

lib/less/tree/ruleset.js

@@ -185,7 +185,7 @@ Ruleset.prototype.evalImports = function(context) {
 Ruleset.prototype.makeImportant = function() {
     var result = new Ruleset(this.selectors, this.rules.map(function (r) {
         if (r.makeImportant) {
-            return r.makeImportant(true);
+            return r.makeImportant();
         } else {
             return r;
         }