`default` keyword is offered in expression-bodied arrow function completions

还没有人认领这个 Issue。

## Bug Report

### Search Terms
- arrow function completion
- default keyword completion
- expression-bodied arrow function
- keyword completions
- completionListAtEndOfWordInArrowFunction

### Version & Regression Information
- This is the behavior in every version I tried, and I reviewed the FAQ for entries about keyword completions in expression-bodied arrow function contexts.

### Playground Link
Playground link with relevant code: https://www.typescriptlang.org/play?#code/PTAEFkE9QYwewCYFNQHM5IM6gBZIE5JA

### Code
```ts
(d, defaultIsAnInvalidParameterName) => d

(d, defaultIsAnInvalidParameterName) => default
```

### Actual behavior
At the expression-bodied arrow function completion position, `default` is offered as a keyword completion.

### Expected behavior
`default` should not appear as a keyword completion in expression-bodied arrow function expression context.

### Additional information about the issue
There are already nearby fourslash tests that appear to acknowledge this behavior as undesirable:
- `tests/cases/fourslash/completionListAtEndOfWordInArrowFunction02.ts`
- `tests/cases/fourslash/completionListAtEndOfWordInArrowFunction03.ts`

I also traced the completion path locally and confirmed the keyword currently comes from the generic `FunctionLikeBodyKeywords` filtering path.

从 issue 中描述的 completion 路径和通用的 FunctionLikeBodyKeywords 过滤路径开始。阅读 tests/cases/fourslash/completionListAtEndOfWordInArrowFunction02.ts 和 tests/cases/fourslash/completionListAtEndOfWordInArrowFunction03.ts，然后使用链接的 Playground 示例重现该 completion。完成的标志是：带表达式体的箭头函数表达式 completion 中不存在 `default`，并且相关的 fourslash 覆盖通过。

由索引模型根据 Issue 内容生成。