fix：修复LinkBlock右侧蜂窝图不显示的问题

(cherry picked from commit aa1c16aba3)

src/views/charts2/charts/linkMonitor/LinkBlock.vue

@@ -243,6 +243,10 @@ export default {
             }
           })
           directionArr = [...new Set(directionArr)]
+          // todo 去重后会被嵌套一层？set方法不修改原数组，也不会再次嵌套，不知原因。记录，以后修改
+          if (directionArr[0]) {
+            directionArr = directionArr[0]
+          }
 
           const newNextHopData = []