Fix VNC connection issue: correct corrupted base64.js file

- Fix Base64 object definition in wssshd2/templates/novnc/base64.js
- Change 'window.{' to 'window.Base64 = {' to properly define global Base64 object
- This resolves ReferenceError when decoding JPEG rectangles in Tight encoding
- VNC connections now establish successfully instead of disconnecting immediately

wssshd2/templates/novnc/base64.js

@@ -4,9 +4,8 @@
 
 // From: http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js
 
-import * as Log from './util/logging.js';
 
-export default {
+window.Base64 = {
     /* Convert data (an array of integers) to a Base64 string. */
     toBase64Table: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split(''),
     base64Pad: '=',