client: fix non-interactive mode in some cases

Before this change, I noticed that some non-interactive commands
don't work,

  $ iwctl version

  $ iwctl help

while other ones do.

  $ iwctl station wlan0 show

This seems to be a typo bug in the if clause checking for additional
arguments.

client/command.c

@@ -753,7 +753,7 @@ options_parsed:
 	argv += optind;
 	argc -= optind;
 
-	if (argc < 2) {
+	if (argc < 1) {
 		interactive_mode = true;
 		return false;
 	}