fix format of test

Author: jonahwilliams

impeller/renderer/blit_pass_unittests.cc

@@ -22,11 +22,13 @@ TEST_P(BlitPassTest, BlitAcrossDifferentPixelFormatsFails) {
   auto blit_pass = cmd_buffer->CreateBlitPass();
 
   TextureDescriptor src_desc;
+  src_desc.storage_mode = StorageMode::kDevicePrivate;
   src_desc.format = PixelFormat::kA8UNormInt;
   src_desc.size = {100, 100};
   auto src = context->GetResourceAllocator()->CreateTexture(src_desc);
 
   TextureDescriptor dst_format;
+  dst_format.storage_mode = StorageMode::kDevicePrivate;
   dst_format.format = PixelFormat::kR8G8B8A8UNormInt;
   dst_format.size = {100, 100};
   auto dst = context->GetResourceAllocator()->CreateTexture(dst_format);