do not reset interrupted flag before interrupting

bubble-server/src/main/java/bubble/service/device/StandardFlexRouterService.java

@@ -97,7 +97,6 @@ public class StandardFlexRouterService extends SimpleDaemon implements FlexRoute
         background(() -> {
             sleep(INTERRUPT_WAIT);
             log.debug("interruptSoon: interrupting...");
-            synchronized (interrupted) { interrupted.set(false); }
             interrupt();
         }, "StandardFlexRouterService.interruptSoon");
     }