Extension: pdbox.ajax.js findSnippets function

`findSnippets` function is not defined globally but is in `snippets` extension  (https://github.com/peckadesign/pd.ajax/blob/fc7bac799b54fb9961558ae50f6fc5f4d40a9522/pd.ajax.js)

extensions/pdbox.ajax.js

@@ -113,7 +113,7 @@
 					history.replaceState($.extend(history.state || {}, {
 						title: document.title,
 						pdbox: pdbox,
-						ui: findSnippets()
+						ui: $.nette.ext('snippets').findSnippets()
 					}), document.title, location.href);
 				}
 			}