Switch isWebKit and isSafari conditions to maintain behavior

Using isWebKit before isSafari could cause Safari to use FileReader even if force === false, since the user agent for Safari also includes AppleWebKit

Author: rajivshah3

dist/FileSaver.js

@@ -155,7 +155,7 @@
 
     var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent);
 
-    if ((isChromeIOS || isWebKit || force && isSafari) && typeof FileReader !== 'undefined') {
+    if ((isChromeIOS || force && isSafari || isWebKit) && typeof FileReader !== 'undefined') {
       // Safari doesn't allow downloading of blob URLs
       var reader = new FileReader();