don't show assignment's course name if you are there
don't show assignment's course name if you are there

as a student, when you go to /courses/x/assignments
it was showing the course name under each assignment,
which was unneeded since it is inferred since you
are "in" that course.

fixes: #6792

test plan:
go to /courses/x/assignments as a student
verify that it looks like this:
http://cl.ly/2m0j450E2C1i3G0A271J
not this:
http://cl.ly/11011P2O1R1z433a2F3F

Change-Id: I5c5944b2d8abd948fbbf05bb38ff8428f26c195e
Reviewed-on: https://gerrit.instructure.com/7888
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>

shidao-fm/canvas-lms,venturehive/canvas-lms,eCNAP/CANVAS,antoniuslin/canvas-lms,kyroskoh/canvas-lms,roxolan/canvas-lms,whalejasmine/canvas-lms,Rvor/canvas-lms,sli7246/canvas_branch,usmschuck/canvas,parbros/red-innovadores-lms,greyhwndz/canvas-lms,nditech/red-innovadores-lms,greyhwndz/canvas-lms,merichar/canvas-lms,SwinburneOnline/canvas-lms,AndranikMarkosyan/lms,ankithbti/canvas_lms,arrivu/hoodemo,sfu/canvas-lms,landonwilkins/canvas-lms,sli7246/canvas_branch,wrdsb/canvas-lms,whalejasmine/canvas-lms,narigone/canvas,djbender/canvas-lms,whalejasmine/canvas-lms,arrivu/jigsaw-lms,arrivu/hiring-site,dgynn/canvas-lms,usmschuck/canvas,eCNAP/CANVAS,Unow/canvas-lms,Unow/ins,efrj/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,efrj/canvas-lms,sfu/canvas-lms,utkarshx/canvas-lms,sli7246/canvas_branch,Unow/canvas-lms,leftplusrightllc/canvas-lms,redconfetti/canvas-lms,sdeleon28/canvas-lms,dgynn/canvas-lms,shidao-fm/canvas-lms,arrivu/arrivu-lms,sdeleon28/canvas-lms,merichar/canvas-lms,AndranikMarkosyan/lms,wye0220/shindig-canvas,narigone/canvas,loganrun/pincan,Jyaasa/canvas-lms,wimemx/Canvas,instructure/canvas-lms,leftplusrightllc/canvas-lms,SwinburneOnline/canvas-lms,Rvor/canvas-lms,arrivu/hoodemo,gbleydon/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,antoniuslin/canvas-lms,wimemx/Canvas,arrivu/jigsaw-lms,arrivu/arrivu-lms,em2/canvas-lms,gbleydon/canvas-lms,arrivu/hiring-site,leftplusrightllc/canvas-lms,loganrun/pincan,HotChalk/canvas-lms,sfu/canvas-lms,tgroshon/canvas-lms,jay3126/canvas-lms,jay3126/canvas-lms,efrj/canvas-lms,dgynn/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms,AndranikMarkosyan/lms,parbros/red-innovadores-lms,fronteerio/canvas-lms,shidao-fm/canvas-lms,tgroshon/canvas-lms,greyhwndz/canvas-lms,gbleydon/canvas-lms,dgynn/canvas-lms,ottenhoff/canvas-lms,Jyaasa/canvas-lms,samuels410/greatlakes-lms,skmezanul/canvas-lms,landonwilkins/canvas-lms,venturehive/canvas-lms,wrdsb/canvas-lms,skmezanul/canvas-lms,utkarshx/canvas-lms,wrdsb/canvas-lms,redconfetti/canvas-lms,samuels410/greatlakes-lms,djbender/canvas-lms,AndranikMarkosyan/lms,va7map/canvas-lms,merichar/canvas-lms,venturehive/canvas-lms,em2/canvas-lms,icelab/canvas,snehakachroo1/LSI_replica,snehakachroo1/LSI_replica,antoniuslin/canvas-lms,Rvor/canvas-lms,eCNAP/CANVAS,jay3126/canvas-lms,landonwilkins/canvas-lms,fronteerio/canvas-lms,arrivu/hiring-site,grahamb/canvas-lms,juoni/canvas-lms,fronteerio/canvas-lms,icelab/canvas,eCNAP/CANVAS,Jyaasa/canvas-lms,narigone/canvas,roxolan/canvas-lms,HotChalk/canvas-lms,leftplusrightllc/canvas-lms,roxolan/canvas-lms,jay3126/canvas-lms,juoni/canvas-lms,wimemx/Canvas,va7map/canvas-lms,sfu/canvas-lms,ShreniiNepal/shrenii_lmp,HotChalk/canvas-lms,whalejasmine/canvas-lms,skmezanul/canvas-lms,ottenhoff/canvas-lms,antoniuslin/canvas-lms,usmschuck/canvas,Rvor/canvas-lms,kyroskoh/canvas-lms,matematikk-mooc/canvas-lms,arrivu/hoodemo,juoni/canvas-lms,sdeleon28/canvas-lms,nditech/red-innovadores-lms,tgroshon/canvas-lms,Unow/canvas-lms,arrivu/arrivu-lms,snehakachroo1/LSI_replica,matematikk-mooc/canvas-lms,arrivu/qibla-ecampus,nditech/red-innovadores-lms,grahamb/canvas-lms,ShreniiNepal/shrenii_lmp,juoni/canvas-lms,utkarshx/canvas-lms,Unow/ins,utkarshx/canvas-lms,sdeleon28/canvas-lms,ankithbti/canvas_lms,matematikk-mooc/canvas-lms,wrdsb/canvas-lms,landonwilkins/canvas-lms,nditech/red-innovadores-lms,usmschuck/canvas,skmezanul/canvas-lms,loganrun/pincan,rup/Tarrax,arrivu/jigsaw-lms,wye0220/shindig-canvas,samuels410/greatlakes-lms,ottenhoff/canvas-lms,instructure/canvas-lms,Jyaasa/canvas-lms,ShreniiNepal/shrenii_lmp,SwinburneOnline/canvas-lms,wye0220/shindig-canvas,HotChalk/canvas-lms,venturehive/canvas-lms,snehakachroo1/LSI_replica,samuels410/greatlakes-lms,rup/Tarrax,Unow/ins,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,redconfetti/canvas-lms,instructure/canvas-lms,rup/Tarrax,instructure/canvas-lms,kyroskoh/canvas-lms,redconfetti/canvas-lms,ShreniiNepal/shrenii_lmp,va7map/canvas-lms,greyhwndz/canvas-lms,narigone/canvas,grahamb/canvas-lms,shidao-fm/canvas-lms,parbros/red-innovadores-lms,efrj/canvas-lms,tgroshon/canvas-lms,roxolan/canvas-lms,djbender/canvas-lms,em2/canvas-lms,va7map/canvas-lms,SwinburneOnline/canvas-lms,arrivu/qibla-ecampus,arrivu/qibla-ecampus,icelab/canvas,kyroskoh/canvas-lms,ankithbti/canvas_lms