Fix calendar deletion
Fix calendar deletion

Deleting calendar previously didn't deleted every occurrence of the calendar in the Calendar Changes table, but only the one with the id corresponding to the calendarId (even with no link between them)
staabm/sabre-dav,macressler/sabre-dav,readdle/sabre-dav,TheTypoMaster/sabre-dav,jeremydenoun/sabre-dav,fkooman/sabre-dav,vmire/sabre-dav,fruux/sabre-dav,PVince81/sabre-dav,fruux/sabre-dav,c0d3z3r0/sabre-dav,kriswebdev/sabre-dav,jeremydenoun/sabre-dav,readdle/sabre-dav,n-6/sabre-dav,vmire/sabre-dav,macressler/sabre-dav,fkooman/sabre-dav,fkooman/sabre-dav,staabm/sabre-dav,staabm/sabre-dav,PVince81/sabre-dav,c0d3z3r0/sabre-dav,vmire/sabre-dav,macressler/sabre-dav,kriswebdev/sabre-dav,c0d3z3r0/sabre-dav,TheTypoMaster/sabre-dav,jeremydenoun/sabre-dav,PVince81/sabre-dav,kriswebdev/sabre-dav,fruux/sabre-dav,TheTypoMaster/sabre-dav,n-6/sabre-dav,readdle/sabre-dav,n-6/sabre-dav