SDL: Whoops, fixed setting fullscreen flag

SDL Commits
1 
From 278e3f91848c6ed5a9d829bcfda49d88994a1477 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sun, 24 Dec 2023 17:12:01 -0800
Subject: [PATCH] Whoops, fixed setting fullscreen flag

---
 src/video/uikit/SDL_uikitwindow.m | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/video/uikit/SDL_uikitwindow.m b/src/video/uikit/SDL_uikitwindow.m
index 8623bcf5b4cf..82229a5a0559 100644
--- a/src/video/uikit/SDL_uikitwindow.m
+++ b/src/video/uikit/SDL_uikitwindow.m
@@ -318,9 +318,9 @@ int UIKit_SetWindowFullscreen(SDL_VideoDevice *_this, SDL_Window *window, SDL_Vi
 {
     @autoreleasepool {
         if (fullscreen) {
-            window->flags &= ~SDL_WINDOW_FULLSCREEN;
-        } else {
             window->flags |= SDL_WINDOW_FULLSCREEN;
+        } else {
+            window->flags &= ~SDL_WINDOW_FULLSCREEN;
         }
         UIKit_UpdateWindowBorder(_this, window);
     }