Revert "Fix case issues with Params"

This reverts commit 239c75c7f8.

There is a ininite loop in there somewhere on my site that needs to be resolved.

hugolib/page.go

@@ -719,9 +719,6 @@ func (p *Page) update(f interface{}) error {
 		return fmt.Errorf("no metadata found")
 	}
 	m := f.(map[string]interface{})
-	// Needed for case insensitive fetching of params values
-	helpers.ToLowerMap(m)
-
 	var err error
 	var draft, published, isCJKLanguage *bool
 	for k, v := range m {