Fix midPoint-Quartz task synchronization

Due to a bug, handler-less tasks were unnecessarily updated
(and some updates were missed). This is now fixed.

This resolves MID-8941.

repo/task-quartz-impl/src/main/java/com/evolveum/midpoint/task/quartzimpl/quartz/QuartzUtil.java

@@ -209,7 +209,7 @@ private static boolean triggerDataMapsDiffer(Trigger triggerAsIs, Trigger trigge
         boolean lbrDiffer = toBe.getBoolean(KEY_LOOSELY_BOUND_RECURRENT) != asIs.getBoolean(KEY_LOOSELY_BOUND_RECURRENT);
         String tbh = toBe.getString(KEY_HANDLER_URI);
         String aih = asIs.getString(KEY_HANDLER_URI);
-        boolean handlersDiffer = tbh != null ? !tbh.equals(aih) : aih == null;
+        boolean handlersDiffer = !Objects.equals(tbh, aih);
 
         if (LOGGER.isTraceEnabled()) {
             if (scheduleDiffer) {