Polish boolean checking in test cases and dashboard (#1664)

sentinel-core/src/test/java/com/alibaba/csp/sentinel/slots/block/flow/controller/RateLimiterControllerTest.java

@@ -61,7 +61,7 @@ public class RateLimiterControllerTest {
                 public void run() {
                     boolean pass = paceController.canPass(node, 1);
 
-                    if (pass == true) {
+                    if (pass) {
                         passcount.incrementAndGet();
                     } else {
                         blockcount.incrementAndGet();

sentinel-dashboard/src/main/java/com/alibaba/csp/sentinel/dashboard/controller/DemoController.java

@@ -108,7 +108,7 @@ public class DemoController {
                 try {
                     e1 = SphU.entry(name);
 
-                    if (slow == true) {
+                    if (slow) {
                         TimeUnit.MILLISECONDS.sleep(3000);
                     }