debian: fix setting the auth domain certificates
debian: fix setting the auth domain certificates

In https://github.com/jitsi/jitsi-meet/commit/94813bc0fda4f382f1abe2a095f9f00c4462b154#diff-6e9552c9bd8e61c8f277c21220160234
two local variables got removed (AUTH_KEY_FILE and AUTH_CRT_FILE), which are used by the sed command
below to configure the virtualhost for auth.

jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,bgrozev/jitsi-meet,bgrozev/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet