Fix uploaded/updated logic for Cloud Storage

[maxbbraun]

The metageneration attribute seems to be a string and not a number. The
strict comparison with 1 in the if/else inverted the logic that
separated file uploads from metadata updates.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If your company signed a CLA, they designated a Point of Contact who decides which employees are authorized to participate. You may need to contact the Point of Contact for your company and ask to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the project maintainer to go/cla#troubleshoot.
• In order to pass this check, please resolve this problem and have the pull request author add another comment and the bot will run again.

[maxbbraun]

I signed the CLA.

[googlebot]

CLAs look good, thanks!

[jmdobry]

The metageneration values in the test need to be updated as well:

https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/functions/helloworld/test/index.test.js#L146

https://github.com/GoogleCloudPlatform/nodejs-docs-samples/blob/master/functions/helloworld/test/index.test.js#L164

[maxbbraun]

Thanks, tests are updated now.

[jmdobry]

Thanks