HarmonyOS 鸿蒙Next CustomDialogController一直是undefined

可以使用CustomDialog参数类型，wrapBuilder是用来封装全局[@Builder](/user/Builder)方法。

参考如下修改：

[@Entry](/user/Entry)
[@Component](/user/Component)
struct Test5 {
  build() {
    Column(){
      DialogBug()
    }
  }
}
[@Component](/user/Component)
export struct DialogBug {
  dialogController: CustomDialogController = new CustomDialogController({
    //builder: getPublishWidgetBuilder().builder,
    builder: Mydialog(),
    cornerRadius: 0,
    customStyle: true,
    alignment: DialogAlignment.Center,
    maskColor: 0x77000000
  })
  build() {
    Column() {
      Button('open').onClick(() => {
        this.dialogController.open()
      })
    }
    .margin({top:200})
  }
}
function getPublishWidgetBuilder():WrappedBuilder<[]> {
  return wrapBuilder(DialogBuilder)
}
[@Builder](/user/Builder)
function DialogBuilder(){
  Mydialog()
}
[@Component](/user/Component)
[@CustomDialog](/user/CustomDialog)
struct Mydialog{
  dialogController?: CustomDialogController
  build() {
    Column(){
      Button('close').onClick(() => {
        if (this.dialogController != undefined) {
          this.dialogController.close()
        }
        console.info('dialogController is undefined')
      })
    }
  }
}