included deleted entries in total message count
included deleted entries in total message count

Since now we show placeholders for deleted entries.

test plan:
 * Create a discussion and a few entries in it
 * Delete one of the entries
 * Ensure that on the topics index page, it shows the count including
   the deleted entry.

Change-Id: If3b3c7000b9afc94f79add73a58f1ed125d891b9
Reviewed-on: https://gerrit.instructure.com/9642
Reviewed-by: Ryan Florence <2d8900489f91ac272fd9ce9d5789db6522668ca2@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>

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