F7-icons React: Some icons using string style causing exception
Some react icons seem to be missing style mapping causing this error:

```
Error

The `style` prop expects a mapping from style properties to values, not a string. For example, style={{marginRight: spacing + 'em'}} when using JSX.
```

Here's a  [demo](https://codesandbox.io/s/evnjr) of the issue. `Airplane` renders correctly, but `PersonAltCircle` does not.