[nostalgia/core] Remove renderer funcions from Context friends

src/nostalgia/core/userland/gfx.cpp

@@ -46,7 +46,7 @@ ox::Error loadBgTileSheet(Context *ctx,
 			pixels[i * 2 + 1] = toColor32(palette->colors[tilesheet->pixels[i] >> 4]);
 		}
 	}
-	return renderer::loadBgTexture(ctx, section, pixels.data(), width, height);
+	return renderer::loadBgTexture(ctx->rendererData<void>(), section, pixels.data(), width, height);
 }
 
 void puts(Context *ctx, int column, int row, const char *str) noexcept {