x11/clipcat: fix build with rust 1.90.0

error: unnecessary parentheses around closure body

--> crates/server/src/snippets/mod.rs:42:33
 |

42 | .map(|file| (async move { (tokio::fs::read(&file).await.ok(), file) })),

|                                 ^                                                        ^
|
= note: requested on the command line with `-D unused-parens`

help: remove these parentheses

|

42 - .map(|file| (async move { (tokio::fs::read(&file).await.ok(), file) })),
42 + .map(|file| async move { (tokio::fs::read(&file).await.ok(), file) }),

PR: 289709
Approved by: portmgr (build fix blanket)