Fix typo

Author: tidoust

Diff for: build/web-specs.ts

@@ -49,7 +49,7 @@ export async function getWebSpec(url: string): Promise<WebSpec | undefined> {
   return specs.find(
     (spec) =>
       url.startsWith(spec.url) ||
-      (spec.nightlyUrl &&
+      (spec.nightly &&
         (url.startsWith(spec.nightly.url) ||
           spec.nightly.alternateUrls.some((s) => url.startsWith(s)) ||
           // When grabbing series nightly, make sure we're grabbing the latest spec version