fix terminal test on Windows

Author: vidartf

tests/test_terminal.py

@@ -276,4 +276,7 @@ def test_shell_command_override(
     pytest.importorskip("traitlets", minversion=min_traitlets)
     argv = shlex.split(f"--ServerApp.terminado_settings={terminado_settings}")
     app = jp_configurable_serverapp(argv=argv)
-    assert app.web_app.settings["terminal_manager"].shell_command == expected_shell
+    if os.name == 'nt':
+        assert app.web_app.settings["terminal_manager"].shell_command in (expected_shell, ' '.join(expected_shell))
+    else:
+        assert app.web_app.settings["terminal_manager"].shell_command == expected_shell