set private fields in node config

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/transform/TbCopyKeysNode.java

@@ -50,9 +50,9 @@ import java.util.regex.Pattern;
 )
 public class TbCopyKeysNode implements TbNode {
 
-    TbCopyKeysNodeConfiguration config;
-    List<Pattern> patternKeys;
-    boolean fromMetadata;
+    private TbCopyKeysNodeConfiguration config;
+    private List<Pattern> patternKeys;
+    private boolean fromMetadata;
 
     @Override
     public void init(TbContext ctx, TbNodeConfiguration configuration) throws TbNodeException {

rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbCopyKeysNodeTest.java

@@ -72,12 +72,6 @@ public class TbCopyKeysNodeTest {
         node.destroy();
     }
 
-    @Test
-    void givenDefaultConfig_whenInit_thenOK() {
-        assertThat(node.config).isEqualTo(config);
-        assertThat(node.patternKeys.size()).isEqualTo(config.getKeys().size());
-    }
-
     @Test
     void givenDefaultConfig_whenVerify_thenOK() {
         TbCopyKeysNodeConfiguration defaultConfig = new TbCopyKeysNodeConfiguration().defaultConfiguration();