Revert "wayland: Don't initialize OpenGL when the window flags didn't specify it"

This reverts commit f522c5380c.

We don't want this change for SDL2, and we're doing further investigation for SDL3.

Fixes https://github.com/libsdl-org/SDL/issues/9035

(cherry picked from commit 120b8d4189)

src/video/wayland/SDL_waylandwindow.c

@@ -1994,6 +1994,13 @@ int Wayland_CreateWindow(_THIS, SDL_Window *window)
     c = _this->driverdata;
     window->driverdata = data;
 
+    if (!(window->flags & SDL_WINDOW_VULKAN)) {
+        if (!(window->flags & SDL_WINDOW_OPENGL)) {
+            SDL_GL_LoadLibrary(NULL);
+            window->flags |= SDL_WINDOW_OPENGL;
+        }
+    }
+
     if (window->x == SDL_WINDOWPOS_UNDEFINED) {
         window->x = 0;
     }