Fix bug with QR generation. It used an inncorrect value for the iid

frontend/src/certs/Registers/RegisterElement.tsx

@@ -141,7 +141,9 @@ export function generateCert(person: Person, register: Register) {
         certYear: year,
         certMonth: month,
         certDay: day,
-        certIId: register.register_code,
+        // THIS WAS PREVIOUSLY THE SAME AS certCode. All QR codes generated before this
+        // was fixed are useless
+        certIId: register.register_id,
         certCustomLabel,
     });
 }