Fix of LineChart display on Safari (iPhone)

[rodnoycry]

This is fix that I found to the issue I filed recently: #782
As I mentioned there are some differences in displaying <svg> element on Safari when no viewport prop specified, and originally LineChart was displayed like this in my minimal reproduction repo:

Deployed example for quick check: https://safari-charts-bug.vercel.app/

As I found out the problem was with method lineSvgComponent of LineChart component. Original code didn't provide any viewport or size of SVG element:

    return (
      <Svg onPress={props.onBackgroundPress}>

There was a few options to fix this issue - specify height prop, specify viewport prop, but I decided to apply style with { overflow: "visible" } as in my opinion most universal option. After this changes LineChart started to display as expected:

Branch of example repo with applied patch: https://github.com/rodnoycry/safari-charts-bug/tree/fixed

Deployed example (you need to copy and paste exact link, as it in preview state of deploy):
https://safari-charts-bug-git-fixed-rodnoycrys-projects.vercel.app/?_vercel_share=soSBCrIc6VDSWWArC7WcvJssXF0AhQr1