rails3: fix erubis for messages
rails3: fix erubis for messages

it's weird/scary that this wasn't an issue for the message tests

Change-Id: I2189eb1f39c3613735fc13beeb4d997f4f9a71cb
Reviewed-on: https://gerrit.instructure.com/29924
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jon Willesen <eb5ce5e6a76c243326fecfa94534101600f87bd9@instructure.com>
Product-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>
QA-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>

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