Bug 1157261 - Fix typo in reference to curFrame in marionette listener. r=ato

--HG--
extra : rebase_source : 8f002e097376b653d44fed2446f4539fd7865999

testing/marionette/listener.js

@@ -437,7 +437,7 @@ function checkForInterrupted() {
     if (wasInterrupted()) {
       if (previousFrame) {
         //if previousFrame is set, then we're in a single process environment
-        cuFrame = actions.frame = previousFrame;
+        curFrame = actions.frame = previousFrame;
         previousFrame = null;
         sandbox = null;
       }