The check for -userid switch has never worked - its condition was
broken since initial commit 9399c662

Since this wasn't caught earlier, the functionality is unused
(and was deprecated anyway - see
https://wiki.openoffice.org/wiki/Framework/Article/Command_Line_Arguments),
this commit just drops the code.

Change-Id: Iae79f9cb7db454d72b11fb3954ebc456c7207d96
Reviewed-on: https://gerrit.libreoffice.org/43123Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>