优化选择数据逻辑，仅保留具有子项的行以便于删除操作

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昨天 fa4a8a332b2b60b7b94b1f763091c1daf8927710

 src/views/equipmentManagement/upkeep/index.vue

@@ -305,10 +305,6 @@
      prop: "deviceModel",
   },
   {
      label: "保养项目",
      prop: "maintenanceLocation",
   },
   {
      prop: "frequencyType",
      label: "频次",
      minWidth: 150,
@@ -366,6 +362,11 @@
      prop: "deviceModel",
   },
   {
      label: "保养项目",
      align: "center",
      prop: "maintenanceLocation",
   },
   {
      label: "计划保养日期",
      align: "center",
      prop: "maintenancePlanTime",