fix handlebars engine's findPartialKey method signature to match new

convention -- this method only needs a string

Author: geoffp

builder/pattern_engines/engine_handlebars.js

@@ -64,7 +64,7 @@
     },
     // given a pattern, and a partial string, tease out the "pattern key" and
     // return it.
-    findPartialKey: function(pattern, partialString) {
+    findPartialKey: function(partialString) {
       var partialKey = partialString.replace(this.findPartialsRE, '$1');
       return partialKey;
     }