redirect when submission_type is basic_lti_launch
redirect when submission_type is basic_lti_launch

closes EVAL-2002
flag=assignments_2_student

Test Plan:
    - ensure assignments_2_student is turned OFF
    - Create assignment with LTI submission option
    - submit as a student to the assignment with the LTI tool
    - turn ON assignments_2_student flag
    - as the student try to view the assignment again with
    your submission and ensure that you are redirected ot the old
    workflow and you can view your old submission and resubmit

Change-Id: I42e598152cb1c606a561c011fd066b9fad57d0e0
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/275157
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Syed Hussain <1379c89cd1d253d3c5a299cc4d8f6002ada9d6b5@instructure.com>
Reviewed-by: Dustin Cowles <25afa0fec7fcf03720748195b533ef56026fd0cf@instructure.com>
QA-Review: Kai Bjorkman <4693b3d9e71784d629732770ab5e83ed8fbdb83e@instructure.com>
Product-Review: Syed Hussain <1379c89cd1d253d3c5a299cc4d8f6002ada9d6b5@instructure.com>

sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms