Correcting path to package.json for running at a path other than root.

kasmweb/app/ui.js

@@ -82,7 +82,7 @@ const UI = {
         // Translate the DOM
         l10n.translateDOM();
 
-        WebUtil.fetchJSON('../package.json')
+        WebUtil.fetchJSON('./package.json')
             .then((packageInfo) => {
                 Array.from(document.getElementsByClassName('noVNC_version')).forEach(el => el.innerText = packageInfo.version);
             })