fix($compile): evaluate against the correct scope with bindToController on new scope

Previously, the directive bindings were evaluated against the directive's
new (non-isolate) scope, instead of the correct (parent) scope.
This went unnoticed most of the time, since a property would be eventually
looked up in the parent scope due to prototypal inheritance. The incorrect
behaviour was exhibited when a property on the child scope was shadowing
that on the parent scope.

This commit fixes it.

Fixes #13021
Closes #13025