Fix VK stencil

Author: bdero

impeller/renderer/backend/vulkan/surface_vk.cc

@@ -62,7 +62,7 @@ std::unique_ptr<SurfaceVK> SurfaceVK::WrapSwapchainImage(
 
   TextureDescriptor stencil0_tex;
   stencil0_tex.storage_mode = StorageMode::kDevicePrivate;
-  stencil0_tex.type = TextureType::kTexture2D;
+  stencil0_tex.type = TextureType::kTexture2DMultisample;
   stencil0_tex.sample_count = SampleCount::kCount4;
   stencil0_tex.format = context->GetCapabilities()->GetDefaultStencilFormat();
   stencil0_tex.size = msaa_tex_desc.size;