add fix for checkmark icon for IE8
add fix for checkmark icon for IE8

michaelletzgus/nextcloud-server,endsguy/server,owncloud/core,owncloud/core,lrytz/core,endsguy/server,xx621998xx/server,IljaN/core,andreas-p/nextcloud-server,Ardinis/server,whitekiba/server,nextcloud/server,bluelml/core,cernbox/core,sharidas/core,phil-davis/core,sharidas/core,owncloud/core,xx621998xx/server,michaelletzgus/nextcloud-server,IljaN/core,sharidas/core,sharidas/core,whitekiba/server,bluelml/core,andreas-p/nextcloud-server,bluelml/core,sharidas/core,michaelletzgus/nextcloud-server,nextcloud/server,pmattern/server,Ardinis/server,pmattern/server,xx621998xx/server,endsguy/server,whitekiba/server,cernbox/core,andreas-p/nextcloud-server,nextcloud/server,bluelml/core,endsguy/server,pollopolea/core,owncloud/core,xx621998xx/server,jbicha/server,jbicha/server,pixelipo/server,Ardinis/server,whitekiba/server,lrytz/core,jbicha/server,lrytz/core,owncloud/core,nextcloud/server,michaelletzgus/nextcloud-server,andreas-p/nextcloud-server,pmattern/server,pixelipo/server,cernbox/core,pixelipo/server,pollopolea/core,cernbox/core,IljaN/core,Ardinis/server,cernbox/core,pmattern/server,whitekiba/server,pixelipo/server,Ardinis/server,endsguy/server,pollopolea/core,pollopolea/core,jbicha/server,pixelipo/server,IljaN/core,jbicha/server,lrytz/core,pmattern/server,andreas-p/nextcloud-server,bluelml/core,xx621998xx/server,IljaN/core,pollopolea/core,lrytz/core