HarmonyOS A页面调用系统的拨打电话api后，点击返回键，回不到A页面

参考如下：可以返回到应用页面，这里返回两次，逐级返回至应用页面

import { call, observer } from '@kit.TelephonyKit';
import { BusinessError } from '@kit.BasicServicesKit';


@Entry
@Component
struct Page {
  build() {
    Column() {
      Text('拨号')
        .padding(50)
        .onClick(this.initCall)
    }
  }

  initCall(){
    // 调用查询能力接口
    let isSupport = call.hasVoiceCapability();
    if (isSupport) {
      // 如果设备支持呼叫能力，则继续跳转到拨号界面，并显示拨号的号码
      call.makeCall("123456", (err: BusinessError) => {
        if (!err) {
          console.log("make call success.");
        } else {
          console.log("make call fail, err is:" + JSON.stringify(err));
        }
      });
      // 订阅通话业务状态变化（可选）
      class SlotId {slotId: number = 0}
      class CallStateCallback {
        state: call.CallState = call.CallState.CALL_STATE_UNKNOWN;
        number: string = "";
      }
      let slotId: SlotId = {slotId: 0}
      observer.on("callStateChange", slotId, (data: CallStateCallback) => {
        console.log("call state change, data is:" + JSON.stringify(data));
      });
    }
  }
}
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