Fix IngressSettings support

[takaaa220]

#815 PR has been merged and released to support IngressSettings.
However, as I commented on #808 (comment), it doesn't seem to work properly, so I fixed it.

My related PR in firebase-tools is firebase/firebase-tools#2924

Thanks!

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Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[takaaa220]

@googlebot I signed it!

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[samtstern]

Thanks for this contribution! @joehan can you take a look at this PR as well as firebase/firebase-tools#2924 ?