Fix missing parentheses for missing_unsafe #20793
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I seem unable to use `Expr::needs_parens*` to complete it
Example
---
```rust
static mut STATIC_MUT: u8 = 0;
fn foo() -> u8 {
STATIC_MUT$0 * 2
}
```
**Before this PR**:
```rust
static mut STATIC_MUT: u8 = 0;
fn foo() -> u8 {
unsafe { STATIC_MUT } * 2
}
```
**After this PR**:
```rust
static mut STATIC_MUT: u8 = 0;
fn foo() -> u8 {
(unsafe { STATIC_MUT }) * 2
}
```
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Fixes #20588
I seem unable to use
Expr::needs_parens*to complete itExample
Before this PR:
After this PR: