When running CppunitTest_sc_macros_test in DrMemory, numerous
unaddressable accesses from SalTimerProc are reported.

During DeInitVCL(), ImplSalStopTimer() shuts down the TimerQueue, but
then the problem is that some disposing of some sidebar related UNO
service ends up calling Window::dispose() and Window::Hide() and
Window::ImplPostPaint(), which starts an Idle job maPaintIdle
that then re-starts the Win32 TimerQueue.

Change-Id: Ie1ab14330b6f1002c12d5302bb19f2b3f4c3811d