perf[uid]: optimize the judgment of uid

net/src/main/java/com/zfoo/net/task/TaskBus.java

@@ -118,10 +118,10 @@ public final class TaskBus {
         if (attachment == null) {
             var session = task.getSession();
             var uid = session.getUid();
-            if (uid <= 0) {
-                execute((int) session.getSid(), task);
-            } else {
+            if (uid > 0) {
                 execute((int) uid, task);
+            } else {
+                execute((int) session.getSid(), task);
             }
         } else {
             execute(attachment.taskExecutorHash(), task);