fix speedgrader multiple submission bug
fix speedgrader multiple submission bug

refs CNVS-13920, refs CNVS-13447

Test plan:
  * submit multiple crocodocable submissions to an assignment for one
    student
  * submit a single crocodocable submission for another student
  * try grading each version of the submissions in speedgrader
  * after grading, you should remain on the same submission version
    (but switching versions should still work)

Change-Id: Idb4244b0ba0f92550a8dbd761a013a67fca8d33a
Reviewed-on: https://gerrit.instructure.com/37711
Reviewed-by: Mike Nomitch <74443f6f110b6b7b934c89126258ed3d843d673f@instructure.com>
QA-Review: Amber Taniuchi <ef4bfd1e6d278f6bc7d4a478f02be2cb9581a0a5@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Product-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>

SwinburneOnline/canvas-lms,Jyaasa/canvas-lms,samuels410/greatlakes-lms,sfu/canvas-lms,wrdsb/canvas-lms,HotChalk/canvas-lms,jay3126/canvas-lms,Jyaasa/canvas-lms,sfu/canvas-lms,tgroshon/canvas-lms,Rvor/canvas-lms,leftplusrightllc/canvas-lms,va7map/canvas-lms,shidao-fm/canvas-lms,shidao-fm/canvas-lms,venturehive/canvas-lms,jay3126/canvas-lms,matematikk-mooc/canvas-lms,wye0220/shindig-canvas,ShreniiNepal/shrenii_lmp,va7map/canvas-lms,narigone/canvas,leftplusrightllc/canvas-lms,grahamb/canvas-lms,wrdsb/canvas-lms,skmezanul/canvas-lms,instructure/canvas-lms,fronteerio/canvas-lms,kyroskoh/canvas-lms,roxolan/canvas-lms,dgynn/canvas-lms,leftplusrightllc/canvas-lms,narigone/canvas,kyroskoh/canvas-lms,Rvor/canvas-lms,ShreniiNepal/shrenii_lmp,efrj/canvas-lms,SwinburneOnline/canvas-lms,SwinburneOnline/canvas-lms,snehakachroo1/LSI_replica,tgroshon/canvas-lms,instructure/canvas-lms,shidao-fm/canvas-lms,fronteerio/canvas-lms,tgroshon/canvas-lms,instructure/canvas-lms,dgynn/canvas-lms,fronteerio/canvas-lms,wrdsb/canvas-lms,greyhwndz/canvas-lms,skmezanul/canvas-lms,utkarshx/canvas-lms,matematikk-mooc/canvas-lms,samuels410/greatlakes-lms,Rvor/canvas-lms,Jyaasa/canvas-lms,narigone/canvas,jay3126/canvas-lms,djbender/canvas-lms,dgynn/canvas-lms,gbleydon/canvas-lms,antoniuslin/canvas-lms,sfu/canvas-lms,roxolan/canvas-lms,djbender/canvas-lms,redconfetti/canvas-lms,eCNAP/CANVAS,instructure/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,ShreniiNepal/shrenii_lmp,grahamb/canvas-lms,wrdsb/canvas-lms,sdeleon28/canvas-lms,kyroskoh/canvas-lms,eCNAP/CANVAS,redconfetti/canvas-lms,matematikk-mooc/canvas-lms,roxolan/canvas-lms,greyhwndz/canvas-lms,samuels410/greatlakes-lms,Rvor/canvas-lms,grahamb/canvas-lms,greyhwndz/canvas-lms,AndranikMarkosyan/lms,whalejasmine/canvas-lms,instructure/canvas-lms,va7map/canvas-lms,juoni/canvas-lms,shidao-fm/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,eCNAP/CANVAS,antoniuslin/canvas-lms,juoni/canvas-lms,AndranikMarkosyan/lms,AndranikMarkosyan/lms,snehakachroo1/LSI_replica,gbleydon/canvas-lms,jay3126/canvas-lms,sdeleon28/canvas-lms,sfu/canvas-lms,efrj/canvas-lms,kyroskoh/canvas-lms,skmezanul/canvas-lms,utkarshx/canvas-lms,redconfetti/canvas-lms,skmezanul/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,whalejasmine/canvas-lms,venturehive/canvas-lms,eCNAP/CANVAS,dgynn/canvas-lms,juoni/canvas-lms,djbender/canvas-lms,antoniuslin/canvas-lms,HotChalk/canvas-lms,Jyaasa/canvas-lms,matematikk-mooc/canvas-lms,wye0220/shindig-canvas,Unow/canvas-lms,tgroshon/canvas-lms,juoni/canvas-lms,sdeleon28/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,ShreniiNepal/shrenii_lmp,instructure/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,utkarshx/canvas-lms,whalejasmine/canvas-lms,utkarshx/canvas-lms,AndranikMarkosyan/lms,sfu/canvas-lms,roxolan/canvas-lms,efrj/canvas-lms,snehakachroo1/LSI_replica,gbleydon/canvas-lms,wye0220/shindig-canvas,efrj/canvas-lms,samuels410/greatlakes-lms,sdeleon28/canvas-lms,va7map/canvas-lms,Unow/canvas-lms,antoniuslin/canvas-lms,greyhwndz/canvas-lms,narigone/canvas,snehakachroo1/LSI_replica,HotChalk/canvas-lms,Unow/canvas-lms,whalejasmine/canvas-lms,redconfetti/canvas-lms,leftplusrightllc/canvas-lms