remove unused code (#17981) (#18048)

(cherry picked from commit 20e714b3d0)

Co-authored-by: Jeff Washington (jwash) <75863576+jeffwashington@users.noreply.github.com>

runtime/src/accounts_db.rs

@@ -5809,7 +5809,6 @@ impl AccountsDb {
                     scan_time_sum += scan_time.as_us();
 
                     if !accounts_map.is_empty() {
-                        let mut _reclaims: Vec<(u64, AccountInfo)> = vec![];
                         let len = accounts_map.len();
 
                         let mut items = Vec::with_capacity(len);