fix(ios-webview): loading of local-file dependency (#6947)
fix(ios-webview): loading of local-file dependency (#6947)

Fixes loading of html dependencies when loading a local file to web view.

I've just implemented the code changes in the patch provided by @gregorywojcik [here](https://github.com/NativeScript/NativeScript/issues/6377#issuecomment-433322681)

references #6377
NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript