style：采集设备-采集周期必填

src/views/iot/device/DeviceForm.vue

@@ -168,9 +168,11 @@ const formRules = reactive({
   create: {
     deviceCode: [{ required: true, message: '设备编码不能为空', trigger: 'blur' }],
     deviceName: [{ required: true, message: '设备名称不能为空', trigger: 'blur' }],
+    sampleCycle: [{ required: true, message: '采集周期不能为空', trigger: 'blur' }],
     isEnable: [{ required: true, message: '是否启用不能为空', trigger: 'blur' }]
   },
   update: {
+    sampleCycle: [{ required: true, message: '采集周期不能为空', trigger: 'blur' }],
     isEnable: [{ required: true, message: '是否启用不能为空', trigger: 'blur' }]
   },
   setting: {