timers: remove unused variable

A recent commit removed the usage of the second argument of
tryOnTimeout but left the definition in place. Remove it.

PR-URL: #18579
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/timers.js

@@ -260,7 +260,7 @@ TimerWrap.prototype[kOnTimeout] = function listOnTimeout(now) {
       continue;
     }
 
-    tryOnTimeout(timer, list);
+    tryOnTimeout(timer);
   }
 
   // If `L.peek(list)` returned nothing, the list was either empty or we have
@@ -289,7 +289,7 @@ TimerWrap.prototype[kOnTimeout] = function listOnTimeout(now) {
 
 // An optimization so that the try/finally only de-optimizes (since at least v8
 // 4.7) what is in this smaller function.
-function tryOnTimeout(timer, list) {
+function tryOnTimeout(timer) {
   timer._called = true;
   const timerAsyncId = (typeof timer[async_id_symbol] === 'number') ?
     timer[async_id_symbol] : null;