Re-remove checking for failed state on hosts when building list of hosts

This was re-added by 63471cd (and modified by me to use iterator again),
it simply needs to be removed.

Fixes #15395

lib/ansible/plugins/strategy/linear.py

@@ -163,7 +163,7 @@ class StrategyModule(StrategyBase):
 
             try:
                 display.debug("getting the remaining hosts for this loop")
-                hosts_left = [host for host in self._inventory.get_hosts(iterator._play.hosts) if host.name not in self._tqm._unreachable_hosts and not iterator.is_failed(host)]
+                hosts_left = [host for host in self._inventory.get_hosts(iterator._play.hosts) if host.name not in self._tqm._unreachable_hosts]
                 display.debug("done getting the remaining hosts for this loop")
 
                 # queue up this task for each host in the inventory