message: fix: wrong asset index validation
diff: @@ -340,7 +340,7 @@ function diagnoseSkeleton(version: string, minecraft: MinecraftFolder): (context
  const jarPath = minecraft.getVersionJar(resolvedVersion.client);
  const missingJar = !await context.execute("checkJar", () => validate(jarPath, resolvedVersion.downloads.client.sha1));
  const assetsIndexPath = minecraft.getAssetsIndex(resolvedVersion.assets);
  - const missingAssetsIndex = await context.execute("checkAssetIndex", async () => validate(assetsIndexPath, resolvedVersion.assetIndex.sha1));
  + const missingAssetsIndex = !await context.execute("checkAssetIndex", async () => validate(assetsIndexPath, resolvedVersion.assetIndex.sha1));
  const libMask = await context.execute("checkLibraries", () => Promise.all(resolvedVersion.libraries.map(async (lib) => {
  const libPath = minecraft.getLibraryByPath(lib.download.path);
  if (await exists(libPath)) {
  