refactor(ngModelController): removed redundant this.$validators initialisation - #8969

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@tbosch should include this in his refactoring #8941

@harrastia - can you please sign the CLA?

I checked, this is part of the refactoring in #8941

Closing this, as part of #8941 which just landed in master.

Hi, thanks for checking this, i signed the CLA in another (personal) account so will have that ready for any further contributions.

That'd good! Contributions are always welcome.