fix eportfolios controller for rails 3 specs

Change-Id: I85716f6be769588c39087173c219182667abb804
Reviewed-on: https://gerrit.instructure.com/29881
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Derek DeVries <ddevries@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>