UGS fails to sync paths given in AdditionalPluginDirectories

UGS fails to sync locations defined using `AdditionalPluginDirectories`.

Mostly here to signal boost patch again, as we are not the only ones running into this: https://github.com/EpicGames/UnrealEngine/pull/12950\#issuecomment\-3409827452

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Hi,

Thank you for bringing this to our attention and providing a PR with a fix.

I’ve reviewed and submitted this PR so it will be live in our GitHub repository soon and rolled into the next major release of UE.

I see that you are also active on this related question:

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I’ve added some additional information there which may be of interest.