Merge pull request tronprotocol#2008 from tronprotocol/hotfix/updatewitness

fix: fix contract type error

Author: renchenchang

src/main/java/org/tron/core/services/http/UpdateWitnessServlet.java

@@ -33,7 +33,7 @@ protected void doPost(HttpServletRequest request, HttpServletResponse response)
       WitnessUpdateContract.Builder build = WitnessUpdateContract.newBuilder();
       JsonFormat.merge(contract, build);
       Transaction tx = wallet
-          .createTransactionCapsule(build.build(), ContractType.AssetIssueContract).getInstance();
+          .createTransactionCapsule(build.build(), ContractType.WitnessUpdateContract).getInstance();
       response.getWriter().println(Util.printTransaction(tx));
     } catch (Exception e) {
       logger.debug("Exception: {}", e.getMessage());