Fix compat with the latest jquery

Stolen^w borrowed from https://github.com/keegnotrub/jquery.fancyzoom/issues/3#issue-388966769

airsonic-main/src/main/webapp/script/jquery.fancyzoom.js

@@ -101,7 +101,7 @@
         if (pImage.src !== href) {
           preloading = true;
           pImage = new Image();
-          $(pImage).load(function() {
+          $(pImage).on('load', function() {
             preloading = false;
           });
           pImage.src = href;