fix(ngMock#$controller): properly assign bindings to all types of controllers (e.g. class-based)

The decorated version of `$controller` is able to assign bindings to a controller instance prior to
instantiation, emulating the behavior of `$compile` with directive controllers.

There are cases, that the actual controller instance is different than the pre-populated one (e.g.
when the controller constructor function returns a value or when the controller is an ES2015 Class).
While `$compile` accounts for such situation, by re-asigning the bindings after the controller has
been instantiated, `ngMock`'s `$controller` didn't.

This commit fixes it, by re-applying the bindings if the actual controller instance is different
than the original one (similar to how `$compile` would do it).

Fixes #14437

Closes #14439