fix refresh user certificate if expired

Change-Id: I1336a9d853e91e7d40dc99322ff6fc2f5674175a

jams-server/src/main/java/net/jami/jams/server/core/workflows/RegisterDeviceFlow.java

@@ -69,7 +69,7 @@ public class RegisterDeviceFlow {
             }
 
             // Renew user certificate if expired with same private key
-            if(user.getCertificate().getNotAfter().after(new Date())) {
+            if(!user.getCertificate().getNotAfter().after(new Date())) {
                 user = UserAuthenticationModule.certificateAuthority.getRefreshedCertificate(user);
                 datastore.updateUserCertificate(user);
             }