Update server width based on desktop size.

lib/units/device/plugins/vnc/util/connection.js

@@ -124,6 +124,8 @@ VncConnection.prototype.writeFramebufferUpdate = function(rectangles) {
       this._write(rect.data)
       break
     case VncConnection.ENCODING_DESKTOPSIZE:
+      this._serverWidth = rect.width
+      this._serverHeight = rect.height
       break
     default:
       throw new Error(util.format(