Did a small change to static bool ImplCallCommand( vcl::Window* pChild, ...) in winproc.cxx file. Patch No. 7

Change-Id: Ib2929ff2fe98487461f2d8ec768fab8d4cd45c22
Reviewed-on: https://gerrit.libreoffice.org/21221Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>