Remove leftover assignment of a local variable.

When we reworked how to do the site configuration some weeks ago, we
also removed the default setting of the 'errorlogname' and 'tcpport'
options in dsm.sys.  However, we missed removing the assignment of a
local variable to those default settings in the tsmclient definition.
This variable was no longer referenced anywhere, so the leftover
assignment didn't actually affect anything, but it would of course
cause readers of the code to wonder what was going on.  Compilation
of manifests for a node would probably also take a tiny bit longer.

Remove this forgotten variable assignment.

Thanks to Hans Persson for noticing it.