fix(android): resolve issue with activity result API registration for fragments

[carlpoole]

Prerequisite: #4405

[jcesarmobile]

I think we could have a helper on Bridge class that help us get the activity or fragment that is going to register for result, something like this:

    public ActivityResultCaller getResultCaller() {
        if (this.fragment != null) {
            return this.fragment;
        } else {
            return this.context;
        }
    }

This way we can avoid having the fragment null check and having to duplicate the code that is called once with getFragment and another one with getActivity when registerForActivityResult` is used

[carlpoole]

I think we could have a helper on Bridge class that help us get the activity or fragment that is going to register for result

Thanks for the idea, this does make it cleaner. Take a look what I added

[jcesarmobile]

Looks good, can you use it in BridgeWebChromeClient too?

[jcesarmobile]

looks good!