refscale: Print out additional module parameters

The refscale.verbose_batched and refscale.lookup_instances module
parameters are omitted from the ref_scale_print_module_parms()
beginning-of-test output.  This commit therefore adds them.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>