Fix publishOptions for powershell-unix

While Unix builds were given their own module folder,
it was only being copied for build, not for publish,
thus breaking some builds.

src/powershell-unix/project.json

@@ -37,6 +37,7 @@
             "Modules/" : {
                 "include": [
                     "../Modules/Windows+Unix-Core",
+                    "../Modules/Unix",
                     "../Modules/Shared"
                 ],
                 "exclude": [