Flat TextInput label flickers if right prop is rendering by condition

### Current behaviour

I want to render right IconButton if TextInput is focus and have non empty text, but label is flickering when right IconButton appears/disappears
### Expected behaviour

If i need to render right iconButton by condition, then label keeps his position and doesn't flicker
### How to reproduce?

```
function TextInputDefault(): React.JSX.Element {
const [text, setText] = useState('');
const [isFocused, setIsFocused] = useState(false);

return (

setText('')}
/>
) : null
}
onFocus={() => setIsFocused(true)}
onBlur={() => setIsFocused(false)}
error={false}
label="Email" //#0062A3
value={text}
onChangeText={(text) => setText(text)}
selectionColor="#317BA8"
cursorColor="#317BA8"
underlineColor="#A3B3C2"
activeUnderlineColor="#007ABE"
textColor="#081C31"
placeholderTextColor="#BFCCD9"
placeholder="Placeholder"
contentStyle={{ backgroundColor: 'transparent' }}
style={{ backgroundColor: '#51667A1A' }}
/>

Email address is invalid!


);
}
```
### Preview

https://github.com/callstack/react-native-paper/assets/98227045/cee707e3-1a18-478e-a0be-19aa38a895af

https://github.com/callstack/react-native-paper/assets/98227045/4abea4bd-d38f-40c3-bad7-0cafb4304459

### Your Environment

| software | version
| --------------------- | -------
| ios | 17.2
| android | 13
| react-native | 0.73.6
| react-native-paper | 5.12.3
| node | 20.5.0
| npm or yarn | 1.22.19
| expo sdk | -

从提供的 TextInput 复现开始，重点关注在聚焦或输入文本期间条件性的右侧 IconButton 发生变化时 Flat TextInput 的标签。完成的标准是：无论处于右侧图标存在还是右侧图标不存在的状态，标签都能保持稳定位置且不闪烁。

由索引模型根据 Issue 内容生成。