feat(net) : optimize the isIdle method

Author: zeusoo001

framework/src/main/java/org/tron/core/net/peer/PeerConnection.java

@@ -167,7 +167,7 @@ public void setBlockBothHave(BlockId blockId) {
   }
 
   public boolean isIdle() {
-    return advInvRequest.isEmpty() && syncBlockRequested.isEmpty() && syncChainRequested == null;
+    return syncBlockRequested.isEmpty() && syncChainRequested == null;
   }
 
   public void sendMessage(Message message) {

framework/src/test/java/org/tron/core/net/peer/PeerConnectionTest.java

@@ -78,7 +78,7 @@ public void testIsIdle() {
     Long time = System.currentTimeMillis();
     peerConnection.getAdvInvRequest().put(item, time);
     f = peerConnection.isIdle();
-    Assert.assertTrue(!f);
+    Assert.assertTrue(f);
 
     peerConnection.getAdvInvRequest().clear();
     f = peerConnection.isIdle();