Run the formatter over the shard-naming change

`cargo fmt --all -- --check` is a CI gate and 9a51cc8 landed two files past
it, so the build has been red on master since regardless of what came after.
Whitespace only — a wrapped `Ok(...)` and two `assert_eq!`s split across
lines. No logic is touched and the tests are unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

core/dr-thumbs/src/lib.rs

@@ -633,9 +633,11 @@ fn mint_client_id(conn: &Connection) -> Result<String, ThumbError> {
          ON CONFLICT(key) DO NOTHING",
         [],
     )?;
-    Ok(conn.query_row("SELECT value FROM meta WHERE key = 'client_id'", [], |r| {
-        r.get(0)
-    })?)
+    Ok(
+        conn.query_row("SELECT value FROM meta WHERE key = 'client_id'", [], |r| {
+            r.get(0)
+        })?,
+    )
 }
 
 const SHARD_SCHEMA: &str = r#"