HTML literals passed into tag helpers don't escape

We are passing values from the database directly into form tag helpers. Users had submitted values that contained HTML entities. The tag helpers did not escape these entities, as it using the escape_once. This behavior is undesired since a user entering data containing HTML literals, then going to the "update" form for that object, not changing anything, then hitting save, will alter the data.

Patch included to fix this behavior.

This ticket accidently posted in the "rails-plugins" project.