package/nginx: fix typo in stream split clients

Commit 3e6b35900f4f4aed4fd11e0187a36a7f374271aa forgot to add a 's' to
ngx_stream_split_client_module

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/nginx/Config.in

@@ -365,7 +365,7 @@ config BR2_PACKAGE_NGINX_STREAM_MAP_MODULE
 	  Enable ngx_stream_map_module
 
 config BR2_PACKAGE_NGINX_STREAM_SPLIT_CLIENTS_MODULE
-	bool "ngx_stream_split_client_module"
+	bool "ngx_stream_split_clients_module"
 	default y
 	help
 	  Enable ngx_stream_split_clients_module