Updated id to $id

[odenman250]

"FirebaseDeploySchema" schema is using the keyword "id" which its support is deprecated. Now using "$id" for schema ID.

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[jamesdaniels]

Thanks for the contribution, we won't be able to merge until the next major release as this would break older versions of Angular that we support.

[odenman250]

Thanks sorry I realised that after committing.

[KingDarBoja]

This is fixed by latest minor release, right?

[jamesdaniels]

I did not remove "id" (as this PR does) but added "$id" in 6.1.5 @KingDarBoja. I would consider this for inclusion in 7.0 which i just released the first alpha of.

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