Fix logical bug in task report scheduling

The conditional for whether to make task progress events repeatable was
inverted. This wasn't actually noticeable because the function
doReport() was being schedule which had a guard to prevent it from
running more frequently than the report period.

main/src/main/scala/sbt/internal/TaskProgress.scala

@@ -48,8 +48,9 @@ private[sbt] class TaskProgress(
       val delay = duration.toMillis
       try {
         val future =
-          if (recurring) scheduler.schedule(runnable, delay, TimeUnit.MILLISECONDS)
-          else scheduler.scheduleAtFixedRate(runnable, delay, delay, TimeUnit.MILLISECONDS)
+          if (recurring)
+            scheduler.scheduleAtFixedRate(runnable, delay, delay, TimeUnit.MILLISECONDS)
+          else scheduler.schedule(runnable, delay, TimeUnit.MILLISECONDS)
         pending.add(future)
         () => Util.ignoreResult(future.cancel(true))
       } catch {