avoid race condition in 06-advanced-functions/09-call-apply-decorators/04-throttle/solution.md

Well there is still a chance for a race condition but a smaller one.
We would need an atomic "if or set" for isThrottled

Author: LLyaudet

1-js/06-advanced-functions/09-call-apply-decorators/04-throttle/solution.md

@@ -12,11 +12,10 @@ function throttle(func, ms) {
       savedThis = this;
       return;
     }
+    isThrottled = true;
 
     func.apply(this, arguments); // (1)
 
-    isThrottled = true;
-
     setTimeout(function() {
       isThrottled = false; // (3)
       if (savedArgs) {