fix: 编辑缺陷处理人也不能修改

--bug=1009257 --user=陈建星 【测试跟踪】复制缺陷后，创建人没变，处理人也不能选 https://www.tapd.cn/55049933/s/10903055

backend/src/main/java/io/metersphere/track/issue/AbstractIssuePlatform.java

@@ -225,6 +225,7 @@ public abstract class AbstractIssuePlatform implements IssuesPlatform {
         issues.setUpdateTime(System.currentTimeMillis());
         issues.setNum(getNextNum(issuesRequest.getProjectId()));
         issues.setPlatformStatus(issuesRequest.getPlatformStatus());
+        issues.setCreator(SessionUtils.getUserId());
         issuesMapper.insert(issues);
         return issues;
     }

frontend/src/business/components/track/issue/IssueEditDetail.vue

@@ -167,7 +167,8 @@ export default {
         creator: null,
         remark: null,
         tapdUsers:[],
-        zentaoBuilds:[]
+        zentaoBuilds:[],
+        zentaoAssigned: ''
       },
       tapdUsers: [],
       zentaoUsers: [],