removed whitespace from a tag to prevent underscore on icon with IE
removed whitespace from a tag to prevent underscore on icon with IE

fixes CNVS-4641

test steps:
- create a discussion of any type and give it a few replies
- hover over the cog on the right side of the reply box
- ensure that there is no underscore ("_") that appears to the
  right of the cog

Change-Id: Ibffe846deeaf026bfdd4af81cbd466ef9e6a167b
Reviewed-on: https://gerrit.instructure.com/18645
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Cam Theriault <b4133c36b6d893d0872cc09e87b536d16aa2d241@instructure.com>
Reviewed-by: Mark Ericksen <776ab05fc6b68e82d2b2c63873bf56edde131809@instructure.com>

sdeleon28/canvas-lms,landonwilkins/canvas-lms,samuels410/greatlakes-lms,venturehive/canvas-lms,ShreniiNepal/shrenii_lmp,va7map/canvas-lms,roxolan/canvas-lms,wrdsb/canvas-lms,grahamb/canvas-lms,arrivu/qibla-ecampus,roxolan/canvas-lms,utkarshx/canvas-lms,SwinburneOnline/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,skmezanul/canvas-lms,HotChalk/canvas-lms,usmschuck/canvas,leftplusrightllc/canvas-lms,fronteerio/canvas-lms,ShreniiNepal/shrenii_lmp,djbender/canvas-lms,fronteerio/canvas-lms,landonwilkins/canvas-lms,kyroskoh/canvas-lms,grahamb/canvas-lms,jay3126/canvas-lms,samuels410/greatlakes-lms,arrivu/hoodemo,tgroshon/canvas-lms,efrj/canvas-lms,utkarshx/canvas-lms,whalejasmine/canvas-lms,skmezanul/canvas-lms,redconfetti/canvas-lms,redconfetti/canvas-lms,arrivu/arrivu-lms,Rvor/canvas-lms,Jyaasa/canvas-lms,loganrun/pincan,arrivu/arrivu-lms,grahamb/canvas-lms,antoniuslin/canvas-lms,shidao-fm/canvas-lms,whalejasmine/canvas-lms,merichar/canvas-lms,SwinburneOnline/canvas-lms,juoni/canvas-lms,sdeleon28/canvas-lms,arrivu/arrivu-lms,arrivu/hoodemo,venturehive/canvas-lms,sfu/canvas-lms,wye0220/shindig-canvas,Rvor/canvas-lms,wimemx/Canvas,skmezanul/canvas-lms,Unow/ins,wimemx/Canvas,Unow/canvas-lms,merichar/canvas-lms,Jyaasa/canvas-lms,efrj/canvas-lms,greyhwndz/canvas-lms,fronteerio/canvas-lms,jay3126/canvas-lms,wye0220/shindig-canvas,arrivu/jigsaw-lms,tgroshon/canvas-lms,arrivu/qibla-ecampus,sli7246/canvas_branch,loganrun/pincan,Unow/canvas-lms,va7map/canvas-lms,kyroskoh/canvas-lms,tgroshon/canvas-lms,shidao-fm/canvas-lms,skmezanul/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,juoni/canvas-lms,redconfetti/canvas-lms,arrivu/jigsaw-lms,sdeleon28/canvas-lms,roxolan/canvas-lms,Jyaasa/canvas-lms,efrj/canvas-lms,loganrun/pincan,wye0220/shindig-canvas,grahamb/canvas-lms,HotChalk/canvas-lms,va7map/canvas-lms,wimemx/Canvas,antoniuslin/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,HotChalk/canvas-lms,Rvor/canvas-lms,sfu/canvas-lms,Unow/canvas-lms,sdeleon28/canvas-lms,grahamb/canvas-lms,whalejasmine/canvas-lms,arrivu/jigsaw-lms,HotChalk/canvas-lms,shidao-fm/canvas-lms,Unow/ins,greyhwndz/canvas-lms,juoni/canvas-lms,sli7246/canvas_branch,jay3126/canvas-lms,leftplusrightllc/canvas-lms,landonwilkins/canvas-lms,efrj/canvas-lms,samuels410/greatlakes-lms,sfu/canvas-lms,whalejasmine/canvas-lms,greyhwndz/canvas-lms,sli7246/canvas_branch,sfu/canvas-lms,greyhwndz/canvas-lms,djbender/canvas-lms,va7map/canvas-lms,Unow/ins,usmschuck/canvas,tgroshon/canvas-lms,usmschuck/canvas,Jyaasa/canvas-lms,landonwilkins/canvas-lms,arrivu/hoodemo,leftplusrightllc/canvas-lms,kyroskoh/canvas-lms,ShreniiNepal/shrenii_lmp,kyroskoh/canvas-lms,roxolan/canvas-lms,wrdsb/canvas-lms,antoniuslin/canvas-lms,shidao-fm/canvas-lms,ShreniiNepal/shrenii_lmp,leftplusrightllc/canvas-lms,jay3126/canvas-lms,utkarshx/canvas-lms,antoniuslin/canvas-lms,arrivu/qibla-ecampus,sfu/canvas-lms,wrdsb/canvas-lms,wrdsb/canvas-lms,utkarshx/canvas-lms,merichar/canvas-lms,fronteerio/canvas-lms,djbender/canvas-lms,samuels410/greatlakes-lms,redconfetti/canvas-lms,usmschuck/canvas,Rvor/canvas-lms,juoni/canvas-lms,sfu/canvas-lms