keyboard: Clear keyboard rest timer when opening immediately

When immediate is true on open(), we want to show the OSK immediately,
it also makes sense to cleanup the keyboard rest timer in that case.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1728>

js/ui/keyboard.js

@@ -1743,12 +1743,13 @@ var Keyboard = GObject.registerClass({
             return;
         }
 
+        this._clearKeyboardRestTimer();
+
         if (immediate) {
             this._open();
             return;
         }
 
-        this._clearKeyboardRestTimer();
         this._keyboardRestingId = GLib.timeout_add(GLib.PRIORITY_DEFAULT,
             KEYBOARD_REST_TIME,
             () => {