removed wrong CONNECTION close header

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/rest/TbHttpClient.java

@@ -132,7 +132,6 @@ public class TbHttpClient {
 
             this.webClient = WebClient.builder()
                     .clientConnector(new ReactorClientHttpConnector(httpClient))
-                    .defaultHeader(HttpHeaders.CONNECTION, "close") //In previous realization this header was present! (Added for hotfix "Connection reset")
                     .build();
         } catch (SSLException e) {
             throw new TbNodeException(e);