Change assertion failure to SAL_WARN

I hit it multiple times and have no interest in figuring out
why. Or time.

Change-Id: I3f22c8b62fdcf987b760ac16bfe8a21a8870d33e
Reviewed-on: https://gerrit.libreoffice.org/42212Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>

vcl/win/app/salinst.cxx

@@ -722,7 +722,7 @@ LRESULT CALLBACK SalComWndProc( HWND, UINT nMsg, WPARAM wParam, LPARAM lParam, i
             // PM_QS_POSTMESSAGE is needed, so we don't process the SendMessage from DoYield!
             while ( PeekMessageW(&aMsg, nullptr, SAL_MSG_TIMER_CALLBACK,
                                  SAL_MSG_TIMER_CALLBACK, PM_REMOVE | PM_NOYIELD | PM_QS_POSTMESSAGE) )
-                assert(! "Multiple timer messages in queue" );
+                SAL_WARN("vcl", "Multiple timer messages in queue");
             GetSalData()->mbOnIdleRunScheduler = false;
             EmitTimerCallback();
             break;