remove dead file
remove dead file

closes CNVS-19321

Was going to make the datepickers here more accessible, but it
looks like this file just doesn't get used anymore (because I can't
turn on "old files" anymore, the featureflag is hard-wired off).

TEST PLAN:
 1) file browsing should not break

Change-Id: I8916cc0d88a1b444b0d7bf3da13856072ec25be0
Reviewed-on: https://gerrit.instructure.com/56572
Tested-by: Jenkins
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Reviewed-by: Dan Minkevitch <2591e5f46f28d303f9dc027d475a5c60d8dea17a@instructure.com>
QA-Review: Jeremy Putnam <b030d6d6f199f844ec424882be473c2ab9adc93b@instructure.com>
Product-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>

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