Fix typo

We want to update the original repo, not a fresh one.

This went undetected because the `git commit` command inside the
`update_git` method ignores failures, and in this case it was failing
because all files are untracked in the new repo.

I will fix that later but for now fix the typo.

bundler/spec/commands/clean_spec.rb

@@ -236,7 +236,7 @@ def should_not_have_gems(*gems)
     bundle "config set path vendor/bundle"
     bundle "install"
 
-    update_git "foo", :path => lib_path("foo-bar")
+    update_git "foo-bar", :path => lib_path("foo-bar")
     revision2 = revision_for(lib_path("foo-bar"))
 
     bundle "update", :all => true