Revert "verify: allow '0' days for reverification"

This reverts commit 7a1a5d206d.

We could already cause the behavior by simply setting ignore-verified
to false, aas that flag is basically an on/off switch for even
considering outdated-after or not.

So avoid the extra logic and just make the gui use the previously
existing way.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/backup/verify.rs

@@ -595,7 +595,7 @@ pub fn verify_filter(
                     let now = proxmox_time::epoch_i64();
                     let days_since_last_verify = (now - last_verify.upid.starttime) / 86400;
 
-                    max_age == 0 || days_since_last_verify > max_age
+                    days_since_last_verify > max_age
                 }
             }
         }