add back gradient for log in page in Firefox, fix accidental removal
add back gradient for log in page in Firefox, fix accidental removal

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