Fix boolean assignment

On --no-vd-system-decoration, the boolean option must be set to false.

It was wrongly assigned from optarg. This worked because optarg is NULL
at this point (so it was converted to false).

app/src/cli.c

@@ -2706,7 +2706,7 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                 opts->angle = optarg;
                 break;
             case OPT_NO_VD_SYSTEM_DECORATIONS:
-                opts->vd_system_decorations = optarg;
+                opts->vd_system_decorations = false;
                 break;
             default:
                 // getopt prints the error message on stderr