After the video interstitial is closed, there is a new space at the bottom of the KeyboardAvoidingView.

# Bug Report

**Before opening**

- [v] Did you try the latest release?
- [v] Did you look for existing issues?

**Ad Modules**
video interstitial

**Platforms**
iOS

**Versions**
14.4.2

**Ads Environment**
- Facebook app installed: yes
- Happens in test (dev build + device is marked as a test device): yes
- Happens in production (release build + **not** a test device): yes
- Facebook review status: [not submitted | approved]

**Current Behaviour**
If there is a KeyboardAvoidingView component on the screen, after the video interstitial is closed and the keyboard appears, a new space is created. Interstitial ads without video do not.

I tested on react native 0.63.4 and 0.64.0.
and I am using latest version of this libaray.

首先，使用 KeyboardAvoidingView 在 React Native 0.63.4 或 0.64.0 中复现 iOS 行为，然后显示一个视频插页广告，并在打开键盘之前将其关闭。将其与非视频插页广告进行比较；完成标准是视频插页广告关闭后底部不出现额外空间。

由索引模型根据 Issue 内容生成。