[feat] fake state on click

Let's change the systray state as soon as the user clicks on it, instead
of waiting for openvpn to notify the status change.

systray.go

@@ -105,14 +105,17 @@ func (bt *bmTray) onReady() {
 
 			case <-bt.mTurnOn.ClickedCh:
 				log.Println("on")
+				bt.changeStatus("starting")
 				bt.bm.StartVPN(provider)
 				bt.conf.setUserStoppedVPN(false)
 			case <-bt.mTurnOff.ClickedCh:
 				log.Println("off")
+				bt.changeStatus("stopping")
 				bt.bm.StopVPN()
 				bt.conf.setUserStoppedVPN(true)
 			case <-bt.mCancel.ClickedCh:
 				log.Println("cancel")
+				bt.changeStatus("stopping")
 				bt.bm.StopVPN()
 				bt.conf.setUserStoppedVPN(true)