SDL: Fixed which window we check flags for when updating fullscreen mode

SDL Commits
1 
From e0e79419b68ce80bb15621e736e37e6f6ae365e5 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 7 Mar 2023 10:08:55 -0800
Subject: [PATCH] Fixed which window we check flags for when updating
 fullscreen mode

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

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index f30811c659d0..12f4e21761e8 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -1446,7 +1446,7 @@ static int SDL_UpdateFullscreenMode(SDL_Window *window, SDL_bool fullscreen)
                 }
 
                 /* only do the mode change if we want exclusive fullscreen */
-                if ((window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN_DESKTOP) {
+                if ((other->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN_DESKTOP) {
                     if (SDL_SetDisplayModeForDisplay(display, &fullscreen_mode) < 0) {
                         return -1;
                     }