fix: clash wireguard config pre-shared-key key name wrong

[Zoupers]

According to config doc, the wg presharedkey config name should be pre-shared-key, not preshared-key.

[netlify]

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[Zoupers]

According to this issue, this change might be not compatiable with previous version of clash, so we might need to add new configuration file for mihomo ?

[geekdada]

@Zoupers What happens when both keys are provided?

[Zoupers]

That's a great idea! I believe there won't be any issues. Let me improve the code.

[geekdada]

Please verify that locally first because Clash verifies the file for unreadable properties.

[Zoupers]

I changed the way to achieve the goal, now we need to specify clashCore to have pre-shared-key. So there will be no need to test clash, just clash-meta.
And I have tested locally, it works fine.

[geekdada]

非常感谢贡献代码！