spkToolbar: Revert the timer introduced in r2882, 2784, 2784, 2786 - it causes slow repainting of the toolbar when form is resized

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3651 8e941d3f-bd1b-0410-a28a-d453659cc2b4