Remove special handling of first ledger tick (#6263)

* Remove special handling of first ledger tick

* Fix subtraction overflow

* @garious feedback

* Back to height

* More tick_height name changes

* Fix off-by-one

* Fix leader tick error

* Fix merge conflict

* Fix recently added test

banking_bench/src/main.rs

@@ -41,7 +41,7 @@ fn check_txs(
     let now = Instant::now();
     let mut no_bank = false;
     loop {
-        if let Ok((_bank, (entry, _tick_count))) = receiver.recv_timeout(Duration::from_millis(10))
+        if let Ok((_bank, (entry, _tick_height))) = receiver.recv_timeout(Duration::from_millis(10))
         {
             total += entry.transactions.len();
         }