platform/tests: don't use translations in test tool

Otherwise, this file would need to be included in POTFILES.in.
This is unnecessary.

Fixes: 06cf1f5e2d ('platform/tests: extend monitor tool to dump the state of NMPlatform')

src/core/platform/tests/monitor.c

@@ -55,8 +55,8 @@ read_argv(int *argc, char ***argv)
             0,
             G_OPTION_ARG_FILENAME,
             &global_opt.state_file,
-            N_("Dump the platform cache to this file"),
+            "Dump the platform cache to this file",
-            N_("FILE")},
+            "FILE"},
            {0},
     };
     gs_free_error GError *error = NULL;