Menu component showing scrollbar indicator

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used [patch-package](https://github.com/ds300/patch-package) to patch `react-native-paper@5.12.3` for the project I'm working on.

🔺️🔺️🔺️ Adding showsVerticalScrollIndicator to Menu component does not disable the scrollbar indicator 🔺️🔺️🔺️

Here is the diff that solved my problem:

```diff
diff --git a/node_modules/react-native-paper/src/components/Menu/Menu.tsx b/node_modules/react-native-paper/src/components/Menu/Menu.tsx
index 82fbdf4..8632b98 100644
--- a/node_modules/react-native-paper/src/components/Menu/Menu.tsx
+++ b/node_modules/react-native-paper/src/components/Menu/Menu.tsx
@@ -663,6 +663,7 @@ class Menu extends React.Component {
{(scrollableMenuHeight && (

{children}

```

This issue body was [partially generated by patch-package](https://github.com/ds300/patch-package/issues/296).

从 src/components/Menu/Menu.tsx 开始，检查 Menu 具有可滚动高度时使用的 ScrollView。以提供的 diff 作为预期行为：Menu 不应再显示垂直滚动条指示器。检查 repository 中现有的 Menu 覆盖情况（如果有），并在支持的平台上验证该行为。

由索引模型根据 Issue 内容生成。