fix bug_7789 (#7790)

Co-authored-by: SbloodyS <sbloodys@qq.com>

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ProcessDefinitionServiceImpl.java

@@ -381,7 +381,7 @@ public class ProcessDefinitionServiceImpl extends BaseServiceImpl implements Pro
             processDefinitionNode.put("id", processDefinition.getId());
             processDefinitionNode.put("code", processDefinition.getCode());
             processDefinitionNode.put("name", processDefinition.getName());
-            processDefinitionNode.put("projectCode", processDefinition.getCode());
+            processDefinitionNode.put("projectCode", processDefinition.getProjectCode());
             arrayNode.add(processDefinitionNode);
         }
         result.put(Constants.DATA_LIST, arrayNode);