Made XPUI.nsh add the Plugin and Include directories relative to XPUI_SYSDIR to make detached installations work better.

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!ifndef XPUI_SYSDIR

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  !define XPUI_SYSDIR "${NSISDIR}\Contrib\ExperienceUI"

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!endif

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!include "${XPUI_SYSDIR}\XPUI.nsh"