config: fix passing of referer value

Author: zkat

lib/config/figgy-config.js

@@ -36,7 +36,7 @@ function mkConfig (...providers) {
       log,
       'npm-session': npmSession,
       'project-scope': npm.projectScope,
-      refer: npm.refer,
+      refer: npm.referer,
       dmode: npm.modes.exec,
       fmode: npm.modes.file,
       umask: npm.modes.umask,