Fixed zip download button for unlimited filesize in public mode
Fixed zip download button for unlimited filesize in public mode

Added missing condition to check whenever allowed zip size is unlimited.

Fixes #3717

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