re-enable announcements for site_admin fixes #5538
re-enable announcements for site_admin fixes #5538

they are still useful at site_admin, since all root accounts inherit them

Change-Id: I87b9e6d8b69813c3bb193b26fe84a2da2b539a28
Reviewed-on: https://gerrit.instructure.com/5469
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>

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