`.unsafe` code snippet on `const {}` expr results in `unsafe const {}` which is invalid Rust

where $0 is the cursor,
```rust
const MY_CONST: usize = const { 1 }.unsafe$0;
```
after completion of the `unsafe` snippet becomes
```rust
const APPLES: usize = unsafe const { 1 }$0;
```
which is invalid rust.

i expected to see
```rs
const APPLES: usize = unsafe { const { 1 }$0 };
```