[Bug] MobileToolbarV2 shows unnecessary space when keyboard is out

### Bug Description

Not sure if I am doing anything wrong, but there is a padding space of proportional size to `toolbarHeight` when the keyboard is up. This happens to be inside the Widget Column inside MobileToolbarV2



### How to Reproduce

Follow the MobileToolbarV2 example and try on a mobile phone. When the keyboard is up, a large padding area shows at the bottom inside MobileToolbarV2

### Expected Behavior

The extra space is not necessary

### Operating System

Android

### AppFlowy Editor Version(s)

4.0.0

### Screenshots

_No response_

### Additional Context

_No response_