help: show option -Y/--syntax in --help output also in restricted mode

Since version 3.2, commit 5ca444e5, nano reads the nanorc files also
in restricted mode (when not also --ignorercfiles is given), meaning
that syntaxes are available and that a specific syntax can be selected
on the command line.  So, the --help output in restricted mode should
list the relevant option: -Y<name> / --syntax=<name>.

(This should have been part of commit b81995af from six years ago.)

src/nano.c

@@ -574,8 +574,7 @@ void usage(void)
 					N_("Which other characters are word parts"));
 #endif
 #ifdef ENABLE_COLOR
-	if (!ISSET(RESTRICTED))
-		print_opt(_("-Y <name>"), _("--syntax=<name>"),
+	print_opt(_("-Y <name>"), _("--syntax=<name>"),
 					N_("Syntax definition to use for coloring"));
 #endif
 #ifndef NANO_TINY