fix(ngModelOptions): work correctly when on the template of `replace` directives

Previously, in order for `ngModel` and `ngModelOptions` to work correctly
together, the latter's pre-linking function should be run before the former's
pre-linking function. This was typically what happened, except when `ngModel`
was used on an element which also had a `replace` directive, whose template
included `ngModelOptions`. In that case, the order was reversed.

This commit fixes it by moving the initialization logic of `ngModelOptions` from
its pre-linking function to its controller's `$onInit()` lifecycle hook.

Fixes #15492

Closes #15493