[tests] Fix shadowed function arg (backport #1835) (#1842)

The function for generating the test description was shadowing its
ur_type argument by a launch_configuration query.

This is currently not used anywhere in the tests, as another generator
function is used in tests where the robot type matters, but it should
get fixed, anyway.

Author: mergify[bot]

ur_robot_driver/test/test_common.py

@@ -574,8 +574,6 @@ def generate_driver_test_description(
     ursim_program_folder=None,
     urcap_folder=None,
 ):
-    ur_type = LaunchConfiguration("ur_type")
-
     launch_arguments = {
         "robot_ip": "192.168.56.101",
         "ur_type": ur_type,