Icon in IconButton not centered and cannot be centered

### Current behaviour
Icon in IconButton is not centered

### Expected behaviour
Icon to be centered

### How to reproduce?
Add background color to IconButton using the style prop.

### Preview

### What have you tried so far?
Adding `alignItems: 'center'` and `justifyContent: 'center'` to both `style` and `contentStyle`. `style` aligned the trash can icon a little bit horizontally, but it was still off.

Adding `backgroundColor` to both `style` and `contentStyle`.

### Your Environment

| software | version
| --------------------- | -------
| ios | x
| android | 13
| react-native | 0.82.1
| react-native-paper | 5.14.5
| node | 22.11.0
| npm or yarn | x.x.x
| expo sdk | x.x.x

首先，使用 issue 中列出的版本，通过 style 提供 backgroundColor，在 Android 上复现 IconButton 布局。跟踪 IconButton 的实现及其图标容器，以确定图标边界为何发生偏移；当按钮具有通过样式设置的背景时图标能够居中，即表示完成。

由索引模型根据 Issue 内容生成。