res/dock:  improve dock-applets showing effect

1. fix wrong size while the first showing dock_applets
2. reduce the delay showing applets time (not include fashion mode)
3. clear "cancelHide" and "_do_hide" code

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/e3b9cb13b513465882d93919afc5f326/

Change-Id: Iff2a5ba713e591a3eca64165e74725affabe909f