Revert "tweak to match how defaulting actually works"

This reverts commit fe944db.

made typescript unhappy because the type narrowing wasn't detected
properly

src/webgpu/util/texture/base.ts

@@ -239,7 +239,7 @@ export function reifyTextureViewDescriptor(
   const format = view.format ?? texture.format;
   const mipLevelCount = view.mipLevelCount ?? texture.mipLevelCount - baseMipLevel;
   const dimension = view.dimension ?? defaultViewDimensionsForTexture(texture);
-  const usage = (view.usage ?? 0) === 0 ? texture.usage : view.usage;
+  const usage = (view.usage === 0 || view.usage === undefined) ? texture.usage : view.usage;
 
   let arrayLayerCount = view.arrayLayerCount;
   if (arrayLayerCount === undefined) {