SDL: Fixed a memory leak at window creation.

SDL Commits
1 
From bea34c53804ada8d90c94aba27262635513452d3 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 8 Nov 2023 14:26:07 -0800
Subject: [PATCH] Fixed a memory leak at window creation.

Windows updates the desktop display mode once at video init (in WIN_InitModes()) and once when creating a window (in WIN_RefreshDisplays())

Fixes https://github.com/libsdl-org/SDL/issues/7982
Fixes https://github.com/libsdl-org/SDL/issues/8189
---
 src/video/SDL_video.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index aa1fee7298c6..df0ad2351137 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -1164,6 +1164,9 @@ const SDL_DisplayMode *SDL_GetClosestFullscreenDisplayMode(SDL_DisplayID display
 
 void SDL_SetDesktopDisplayMode(SDL_VideoDisplay *display, const SDL_DisplayMode *mode)
 {
+    if (display->desktop_mode.driverdata) {
+        SDL_free(display->desktop_mode.driverdata);
+    }
     SDL_memcpy(&display->desktop_mode, mode, sizeof(*mode));
     display->desktop_mode.displayID = display->id;
     SDL_FinalizeDisplayMode(&display->desktop_mode);