sync: taskd.trust parameter is ignored

首先跟踪 taskd 同步配置期间使用的 taskrc 导入和验证流程。使用 taskd.trust=ignore hostname 重现该设置，然后跟踪保存的配置直到同步尝试。完成的标准是 trust 参数得到保留，并且同步要么成功，要么报告有用的错误。

Describe your issue

When configuring task server the app asks to choose file or paste content of .taskrc. Either way when I give it config with option taskd.trust=ignore hostname it is not preserved in final config.

It is only my guess that in my particular case missing trust parameter is the problem. The guess is based on knowledge that my setup needs that option (doesn't work without it), and that it is not there in config after save.
I have made sure this works on other clients, like foreground on android and official binary ver. 2.6.2 on desktop

Steps to reproduce

Confgure taskd server
Issue self-signed certificate with arbitrary (wrong) domain
Copy certs and cred to client with taskwarrior-flutter
Configure sync. Give it taskrc file (with taskd.trust=ignore hostname option) and certs. It will show no errors (if everything done right)
Tap at "Taskrc file is verified". It will show config, "trust" parameter is missing
Try to sync. It will show no errors. However nothing is synced.

What was the expected result?

Sync is expected to work, or at least show any errors.

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