Fix static height value of viewBox

[aykutkardas]

https://github.com/aykutkardas/react-icomoon/blob/master/src/index.tsx#L66

Current:

 props.viewBox = `0 0 ${width} 1024`;

Expected:

 props.viewBox = `0 0 ${width} ${width}`;

[aykutkardas]

This change may cause some problems. Suspended for now.

[jtraub]

@aykutkardas what problems can it cause?

[aykutkardas]

@aykutkardas what problems can it cause?

Icons are taken from icomoon at a fixed height. This prevents this part from being dynamic. Because only a limited part of the icon is visible.

I was working on an alternative svg parser tool to Icomoon and so I wanted to do it but I don't need it anymore. So it's a trivial issue and now react-icomoon works pretty stable.