修复bug，表名写错导致删除告警计划错误

core/alarm_plan_manager.py

@@ -89,7 +89,7 @@ class AlarmPlanManager:
                 LOGINFO(f"remove alarm_plan: {plan_uuid}, {plan_name}")
 
             if plan_uuid in self.alarm_plan_cron_map_:
-                plan_name = self.alarm_plan_map_[plan_uuid]
+                plan_name = self.alarm_plan_cron_map_[plan_uuid]
                 del self.alarm_plan_cron_map_[plan_uuid]
                 removed = True
                 LOGINFO(f"remove alarm_plan: {plan_uuid}, {plan_name}")