fix(scripts): pass in opts.dir directly

Author: zkat

index.js

@@ -389,7 +389,8 @@ class Installer {
         pkg, stage, pkgPath, LifecycleOpts(this.opts).concat({
           // TODO: can be removed once npm-lifecycle is updated to modern
           //       config practices.
-          config: this.opts
+          config: this.opts,
+          dir: this.prefix
         }))
       ).tap(() => { this.timings.scripts += Date.now() - start })
     }