use correct app-icon class for new apps as well, fix icon size
use correct app-icon class for new apps as well, fix icon size

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