0018594: 【web客户端】【基础检查】填写血氧和BMI的数值后，切换到其他检测项，再回到BMI和血氧，值都被清空了

lib/pages/medical/widgets/body_weight_height.dart

@@ -121,7 +121,7 @@ class _ExamBodyWeightState extends State<BodyWeightHeight> {
     /// 体检系统 基础检查的特殊处理
     if (controller.diagnosisDataValue['Weight'] != null ||
         controller.diagnosisDataValue['Height'] != null ||
-        controller.diagnosisDataValue['BMI'] != null) {
+        controller.diagnosisDataValue['Bmi'] != null) {
       _weight = controller.diagnosisDataValue['Weight'] ?? '';
       _height = controller.diagnosisDataValue['Height'] ?? '';
       _bmi = controller.diagnosisDataValue['Bmi'] ?? '';