Stop ErrorNotification’s time on close

Otherwise, if there is another notification before the timer runs out,
it will close the new notification sooner than expected.

src/ErrorNotification.qml

@@ -67,6 +67,7 @@ Control {
             text: qsTr("Close")
 
             onClicked: function () {
+                hideTimer.stop();
                 control.visible = false;
             }
         }