Fix source path when share is a mount point
Fix source path when share is a mount point

Whenever an external storage mount point is shared directly, its path is
empty which causes a leading slash to appear in the source path.

This fix removes the bogus leading slash in such situation.

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