Revert "lok: Assertion `m_aProcessingUserEvents.empty()' failed"

This reverts commit ad35cc9e.

Change-Id: I8943deb0b78a14d10ed6e8d052b2ac8eb58bccae
Reviewed-on: https://gerrit.libreoffice.org/46321Reviewed-by: Henry Castro <hcastro@collabora.com>
Tested-by: Henry Castro <hcastro@collabora.com>

vcl/source/app/salusereventlist.cxx

@@ -53,6 +53,7 @@ bool SalUserEventList::DispatchUserEvents( bool bHandleAllCurrentEvents )
 
     {
         osl::MutexGuard aGuard( m_aUserEventsMutex );
+        assert( m_aProcessingUserEvents.empty() );
         if( ! m_aUserEvents.empty() )
         {
             if( bHandleAllCurrentEvents )