Adding a timeout seems to help Windows a lot to actually bring
the browser into the front, especially when it was closed before.

Still no 100% success rate, but much improved now.

Change-Id: I62affee4b837e0a60b1aac2a20be6fe7c3f9d2e0
Reviewed-on: https://gerrit.libreoffice.org/51132Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>