tweak task state success check

Author: William Hou

SingularityService/src/main/java/com/hubspot/singularity/scheduler/SingularityScheduler.java

@@ -1015,8 +1015,9 @@ private Optional<PendingType> handleCompletedTaskWithStatistics(
 
     if (!isDeployInUse(requestDeployState, taskId.getDeployId(), true)) {
       // failed tasks with remaining retries cannot short circuit here
+      // isFailed is false for lost and other weird task states
       if (
-        !state.equals(ExtendedTaskState.TASK_FINISHED) &&
+        !state.isSuccess() &&
         (
           deployStatistics.getNumSequentialRetries() <
           request.getNumRetriesOnFailure().orElse(0)