Backed out changeset 1cde3dd0f44d - this breaks windows which are created and then set to FULLSCREEN_DESKTOP

src/video/SDL_video.c

@@ -1480,13 +1480,6 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
         return NULL;
     }
 
-    /* Some platforms don't have a window manager */
-    if (SDL_strcmp(_this->name, "KMSDRM") == 0) {
-        if (!(flags & SDL_WINDOW_FULLSCREEN)) {
-            flags |= SDL_WINDOW_FULLSCREEN;
-        }
-    }
-
     /* Some platforms have OpenGL enabled by default */
 #if (SDL_VIDEO_OPENGL && __MACOSX__) || (__IPHONEOS__ && !TARGET_OS_MACCATALYST) || __ANDROID__ || __NACL__
     if (!_this->is_dummy && !(flags & SDL_WINDOW_VULKAN) && !(flags & SDL_WINDOW_METAL) && !SDL_IsVideoContextExternal()) {