fix(bug): 修复普通离店时医保与自费切换逻辑错误

- 修正了 is_mt 字段的逻辑判断
- 确保在不同支付方式下正确设置 is_mt 值
- 解决了医保和自费切换时可能出现的问题

src/views/jiesuan/outpatientCharging.vue

@@ -2089,7 +2089,7 @@ export default {
                 cash_pay: this.bxxxinfo.his_deduct_amount,
                 pre_key: this.bxxxinfo.pre_key,
                 cache_key: this.form.cache_key,
-                 is_mt: this.man_name == '3' ? false : this.man_name == '2' ? true : this.selectTableArr[0] ? this.selectTableArr[0].settle_type.is_mt : '',
+                is_mt: this.man_name == '3' ? false : this.man_name == '2' ? true : this.selectTableArr[0] ? this.selectTableArr[0].settle_type.is_mt : '',
                 settle_type: this.selectTableArr[0] ? this.selectTableArr[0].settle_type.code : '',
             }