RxTextField is broken on iOS

[CassiusPacheco]

Hi Zaiste,

first of all your content is awesome! I've been learning quite a lot with your videos. I was playing with the source code and I noticed that the compose screen doesn't work and that's because the enableInteractiveSelection argument needs a default value. Setting it to true fixes the problem. For example:

this.enableInteractiveSelection = true

I'd open a PR myself to the component but I couldn't find it in your repos and I reckon it's not worth fixing it here in this repository because this is part of your video classes.