BrnStepInputFormItem开始手动输入的BUG

[sunguoxing0628]

问题提交

1、BUG 描述

使用BrnStepInputFormItem组件，并设置canManualInput 为true时，如果默认显示0，在不删除当前0的情况下直接输入任何数字，都是显示以0开头的数字，如输入20组件显示为020，且onChanged 的newValue为20

2、复现步骤

1.使用BrnStepInputFormItem组件，并设置canManualInput 为true；

2.默认显示0的情况下，在光标后直接输入20（此数字为例子）；

3.显示内容为020，且onChanged 的newValue为20

3、期望行为

显示内容为20，且onChanged 的newValue为20

4、运行环境

• 运行设备：HUAWEI MatePad
• 系统：Harmony OS
• Bruno 版本：3.3.0
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