MINOR: tasks: make run_tasks_from_lists() scan the queues itself

Now process_runnable_tasks is responsible for calculating the budgets
for each queue, dequeuing from the tree, and calling run_tasks_from_lists().
This latter one scans the queues, picking tasks there and respecting budgets.
Note that its name was updated with a plural "s" for this reason.
diff --git a/src/debug.c b/src/debug.c
index b4475f3..6f46591 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -142,7 +142,7 @@
 
 			if (dump == 2) {
 				/* dumping */
-				if (addr == run_poll_loop || addr == main || addr == run_tasks_from_list) {
+				if (addr == run_poll_loop || addr == main || addr == run_tasks_from_lists) {
 					dump = 3;
 					*buf = bak;
 					break;