[rcore][win32] use SwapBuffers instead of wglSwapLayerBuffers

I don't understand OpenGL well enough to know the difference between
SwapBuffers and wglSwapLayerBuffers but the former seems to double
my FPS (from 2000 to about 4000 in core_vr_simulator).

Author: marler8997

src/platforms/rcore_desktop_win32.c

@@ -1435,8 +1435,8 @@ void DisableCursor(void)
 void SwapScreenBuffer(void)
 {
     if (!global_hdc) abort();
-    if (!wglSwapLayerBuffers(global_hdc, WGL_SWAP_MAIN_PLANE)) {
-        LogFail("wglSwapLayerBuffers", GetLastError());
+    if (!SwapBuffers(global_hdc)) {
+        LogFail("SwapBuffers", GetLastError());
         abort();
     }
 }