Use `getParam` instead of `server`
Use `getParam` instead of `server`

`server` is completely wrong here and this will not work on master. With `getParam` it will work fine though.

Testplan:
- [ ] Without patch: Share a file and try to access `http://localhost/public.php?service=files&t=THESHAREDTOKEN` => Fails
- [ ] With patch: Try the same => Works

Master only.

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