yarn2nix: no sha1 for github tarballs

Since b27d18a412 we fetch packages with codeload.github.com tarballs as
resolved field with fetchgit. The sha1 of the tarball is irrelevant,
instead nix-prefetch-git will be used to determine the expected fetchgit
FOD hash.

Fixes #143828

pkgs/development/tools/yarn2nix-moretea/yarn2nix/lib/fixPkgAddMissingSha1.js

@@ -48,7 +48,7 @@ async function fixPkgAddMissingSha1(pkg) {
 
   const [url, sha1] = pkg.resolved.split('#', 2)
 
-  if (sha1) {
+  if (sha1 || url.startsWith('https://codeload.github.com')) {
     return pkg
   }