FAB size prop doesnt work if label is provided

### Current behaviour
FAB size prop doesnt work if label is provided

### Expected behaviour
FAB size should change depending on the size prop even if label is provided

### How to reproduce?
Add a FAB with only icon and size props. It works with small, medium, large sizes fine.
Now add label prop. The FAB is fixed to medium size only, changing size prop has no effect.

### Preview

### What have you tried so far?

### Your Environment

| software | version
| --------------------- | -------
| ios | 17.4
| android | x
| react-native | 0.79.3
| react-native-paper | 5.12.5
| node | x.x.x
| npm or yarn | x.x.x
| expo sdk | 3.0.20

从 FAB 组件开始，在报告的 React Native Paper 5.12.5 环境中使用 icon、size 和 label props 在 iOS 上复现该问题。比较有 label 和没有 label 时的 small、medium 和 large 尺寸；当 size prop 能一致地改变带 label 的 FAB 时，即表示完成。

由索引模型根据 Issue 内容生成。