OleServer::provideService() was not called anywhere. That means the
ProviderOleWrapper class is unused, too. Which is good, as it seemed
to largely be identical to OneInstanceOleWrapper anyway.

Change-Id: If8782d56ed1ec1bb173cfc18be585be4c331f335
Reviewed-on: https://gerrit.libreoffice.org/54647Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tor Lillqvist <tml@collabora.com>