Auto-fix incorrect commas in `use` list

[nk9]

Today, this code is auto-fixed:

use sqlx::{PgPool, };
use std::path::{Path, PathBuf, };

The correct replacement is:

use sqlx::PgPool;
use std::path::{Path, PathBuf};

But the following code results in parse errors and is not auto-fixed by rust-analyzer:

use sqlx::{, PgPool};
use std::path::{Path, , PathBuf};

It is always possible to remove stray/duplicate commas and any number of spaces in use directives like this to produce correct code. In almost every circumstance, this will be what the user intended. I don't think it's necessary to attempt to properly parse a use without curly braces, that seems much more fraught. But I often find myself wanting to remove an import I no longer need, and I have to take the extra step of removing the comma too, despite the intention being unambiguous once the symbol is gone.

[ChayimFriedman2]

We don't actually fix the code, rustfmt does that, and it does not work with incorrect code.

[nk9]

Ah, apologies, I'll have a look in that repo instead.

[nk9]

@rustbot transfer rustfmt

[rustbot]

Only team members may use the transfer command.

[nk9]

I'd like to have this be in the correct repo. Would appreciate a transfer.

[lnicola]

@rustbot transfer rustfmt