Support ModalPresentationIOS transition preset

Nobody has claimed this yet.

The animation begins smoothly, but when the animation finishes, the items (`SharedElement`s) are off by some pixels which causes this stuttering glitch. This issue only appears when using the `ModalPresentationIOS` transition preset. All other presets work fine.

Demo here:

My Navigator:

```js
const SharedElementStack = createSharedElementStackNavigator();
function HomeSharedElementStackNavigator() {
return (


{
const {item} = route.params;
return [
{
id: `item.${item.id}.image`,
animation: 'fade',
},
{
id: `item.${item.id}.title`,
animation: 'fade',
},
{
id: `item.${item.id}.description`,
animation: 'fade',
},
];
}}
/>

);
}
```

I've tried playing around with the `animation` property, but I can't seem to get it working with this animation I found in the example project (`springyFadeIn.js`):

```js
import {Animated} from 'react-native';
export function springyFadeIn() {
const transitionSpec = {
timing: Animated.spring,
tension: 10,
useNativeDriver: true,
};
return {
transitionSpec,
screenInterpolator: ({position, scene}) => {
const {index} = scene;

const opacity = position.interpolate({
inputRange: [index - 1, index],
outputRange: [0, 1],
});

return {opacity};
},
};
}
```

Packages used:
```json
// ...
"react": "16.9.0",
"react-native": "0.61.5",
"react-navigation-shared-element": "^5.0.0-alpha1",
// ...
```

I don't know if that's a bug in the library or if I am making a mistake, would appreciate some help here!

Reproduce the transition using the provided SharedElementStack navigator and the ModalPresentationIOS preset with the listed React Native and react-navigation-shared-element versions. Compare it with the other presets and the springyFadeIn example; the issue is done when SharedElements no longer shift or stutter at the end of the transition.

Written by the indexing model from the issue text.