SDL: Return correct button id

SDL Commits
1 
From d0cf3b75551561b173743db02c9393ed11a6a065 Mon Sep 17 00:00:00 2001
From: meyraud705 <[EMAIL REDACTED]>
Date: Tue, 20 Apr 2021 18:26:02 +0200
Subject: [PATCH] Return correct button id

---
 src/video/wayland/SDL_waylandmessagebox.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/wayland/SDL_waylandmessagebox.c b/src/video/wayland/SDL_waylandmessagebox.c
index f42414531..d944833b3 100644
--- a/src/video/wayland/SDL_waylandmessagebox.c
+++ b/src/video/wayland/SDL_waylandmessagebox.c
@@ -167,7 +167,7 @@ Wayland_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
                     for (i = 0; i < messageboxdata->numbuttons; i += 1) {
                         if (messageboxdata->buttons[i].text != NULL) {
                             if (SDL_strcmp(output, messageboxdata->buttons[i].text) == 0) {
-                                *buttonid = i;
+                                *buttonid = messageboxdata->buttons[i].buttonid;
                                 break;
                             }
                         }