ui: qemu/Config: disable xtermjs and spice until status is loaded

We enable/disable spice/xtermjs for the console button in the 'load'
callback of the statusstore, depending on the vms capabilities,
but until the first load there, the only safe option is novnc.

So we have to disable xtermjs and spice on start, else a click on
the button might open a window that cannot connect to the vm.

a forum user probably triggered this:
https://forum.proxmox.com/threads/unable-to-find-serial-interface-console-problem.87705

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

www/manager6/qemu/Config.js

@@ -199,6 +199,8 @@ Ext.define('PVE.qemu.Config', {
 	    disabled: !caps.vms['VM.Console'],
 	    hidden: template,
 	    consoleType: 'kvm',
+	    enableSpice: false,
+	    enableXtermjs: false,
 	    consoleName: vm.name,
 	    nodename: nodename,
 	    vmid: vmid,