fix: 修复退出时音量未保存问题

[pengfeixx]

退出时等待文件写入完成后再退出

Bug: https://pms.uniontech.com/bug-view-242507.html
Log: 修复部分已知问题

[myk1343]

[是否满足兼容性要求] y
[是否满足commit提交规范] y
[是否满足编码规范] y
[review结论] pass
[fail原因] n/a

[hundundadi]

[是否满足兼容性要求] y
[是否满足commit提交规范] y
[是否满足编码规范] y
[review结论] pass
[fail原因] n/a

[feeengli]

[是否满足兼容性要求] y
[是否满足commit提交规范] y
[是否满足编码规范] y
[review结论] pass
[fail原因] n/a

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lzwind, pengfeixx

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