Fix code generation when using receiver bindings and @AssistedFactory

[asapha]

The code generation would sometimes double the this expressions

public class InjectAssistedFactoryComponent : AssistedFactoryComponent() {
  override val barFactory: AssistedBarFactory
    get() = object : AssistedBarFactory {
      override fun build(num: Int, name: String): FactoryAssistedBar = FactoryAssistedBar(
        num = num,

        // compilation failure here
        foo = this@InjectAssistedFactoryComponent.this@InjectAssistedFactoryComponent.provideFoo().bind,

        name = name,
        provided = this@InjectAssistedFactoryComponent.name
      )
    }

Continuation for #487

[evant]

thanks!