fix verified email

src/main/java/de/cantorgymnasium/auth/provider/user/mailcowUser.java

@@ -60,6 +60,11 @@ class mailcowUser extends AbstractUserAdapter {
         return domain;
     }
 
+    @Override
+    public boolean isEmailVerified() {
+        return true;
+    }
+
     @Override
     public Map<String, List<String>> getAttributes() {
         MultivaluedHashMap<String, String> attributes = new MultivaluedHashMap<>();