There's no point in restoring the interruption flag (#478)

Author: pivovarit

src/main/java/com/pivovarit/collectors/Dispatcher.java

@@ -71,7 +71,6 @@ void stop() {
         try {
             workingQueue.put(POISON_PILL);
         } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
             completionSignaller.completeExceptionally(e);
         } finally {
             dispatcher.shutdown();