convert courses course wizard box js_block into js_bundle

test plan:
* regression test course wizard box

Change-Id: I6e5fee9f2b6c68231ddcd9d744fb76dee8a7bb7c
Reviewed-on: https://gerrit.instructure.com/29157
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Product-Review: Landon Wilkins <lwilkins@instructure.com>