Always hide local cursor initally

We don't know if the server will support a client side cursor, so
we have to assume a server side one to start with.

core/rfb.js

@@ -1084,6 +1084,10 @@ RFB.prototype = {
         this._timing.fbu_rt_start = (new Date()).getTime();
         this._timing.pixels = 0;
 
+        // Cursor will be server side until the server decides to honor
+        // our request and send over the cursor image
+        this._display.disableLocalCursor();
+
         this._updateConnectionState('connected');
         return true;
     },