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considering outdated-after or not.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>

pbs-api-types/src/jobs.rs

@@ -156,7 +156,7 @@ pub const IGNORE_VERIFIED_BACKUPS_SCHEMA: Schema = BooleanSchema::new(
 
 pub const VERIFICATION_OUTDATED_AFTER_SCHEMA: Schema =
     IntegerSchema::new("Days after that a verification becomes outdated. (0 means always)")
-        .minimum(0)
+        .minimum(1)
         .schema();
 
 #[api(