converts eportfolios/_wizard_box js_block into js_bundle

test plan:
* regression test eportfolio wizard box

Change-Id: I94cbba4e6d95649bc327226a0c7dc407cce53577
Reviewed-on: https://gerrit.instructure.com/29155
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Stanley Stuart <stanley@instructure.com>
Product-Review: Marc LeGendre <marc@instructure.com>
QA-Review: Marc LeGendre <marc@instructure.com>