direct3d: Remove unnecessary render target support check.

Direct3D 9 dictates that caps.NumSimultaneousRTs must always be at least 1,
which is to say that Direct3D 9 level hardware must always support render
targets.

(caps.NumSimultaneousRTs is meant to show if you can draw to multiple render
targets in a single draw call.)

We had already hardcoded SDL_RENDERER_TARGETTEXTURE as available earlier in
the function anyhow.

Fixes #4781.

src/render/direct3d/SDL_render_d3d.c

@@ -1908,9 +1908,6 @@ D3D_CreateRenderer(SDL_Window * window, Uint32 flags)
     IDirect3DDevice9_GetDeviceCaps(data->device, &caps);
     renderer->info.max_texture_width = caps.MaxTextureWidth;
     renderer->info.max_texture_height = caps.MaxTextureHeight;
-    if (caps.NumSimultaneousRTs >= 2) {
-        renderer->info.flags |= SDL_RENDERER_TARGETTEXTURE;
-    }
 
     if (caps.PrimitiveMiscCaps & D3DPMISCCAPS_SEPARATEALPHABLEND) {
         data->enableSeparateAlphaBlend = SDL_TRUE;