samples: http_server: Fix warning about integer name

When building with CONFIG_DEBUG=y, there is a build warning about the
name being truncated due to integer size is larger than MAX_NAME_LEN.
So fix MAX_NAME_LEN to be large enough to handle 10 digit integer, which
is maximum.

Signed-off-by: Declan Snyder <[email protected]>

Author: decsny

samples/net/sockets/http_server/src/ws.c

@@ -321,7 +321,7 @@ int ws_echo_setup(int ws_socket, struct http_request_ctx *request_ctx, void *use
 			K_NO_WAIT);
 
 	if (IS_ENABLED(CONFIG_THREAD_NAME)) {
-#define MAX_NAME_LEN sizeof("ws[xx]")
+#define MAX_NAME_LEN (sizeof("ws[]") + 10)
 		char name[MAX_NAME_LEN];
 
 		snprintk(name, sizeof(name), "ws[%d]", slot);