Avoiding a memory leak in the Timer class SchedulerLoop

Update to my previous commit.  The same change needed
to be made here.

Author: bholmes

mcs/class/corlib/System.Threading/Timer.cs

@@ -427,7 +427,7 @@ int RunSchedulerLoop () {
 				}
 
 				if (needReSort) {
-					list.Sort(comparer);
+					list.Sort(comparer.Compare);
 					needReSort = false;
 				}