server/cli_list_entrypoint: Fix execution of C++ CLIs
server/cli_list_entrypoint: Fix execution of C++ CLIs

This commit fixes the following error:

Traceback (most recent call last):
  File "/build/slicer_cli_web/server/cli_list_entrypoint.py", line 102, in <module>
    CLIListEntrypoint()
  File "/build/slicer_cli_web/server/cli_list_entrypoint.py", line 93, in CLIListEntrypoint
    subprocess.call(script_file + sys.argv[2:])
TypeError: cannot concatenate 'str' and 'list' objects

girder/slicer_cli_web,girder/slicer_cli_web