repair user merging tool (#498)

subscription/models.py

@@ -165,7 +165,4 @@ class Subscription(models.Model):
         return user.is_in_group(settings.SITH_MAIN_BOARD_GROUP) or user.is_root
 
     def is_valid_now(self):
-        return (
-            self.subscription_start <= date.today()
-            and date.today() <= self.subscription_end
-        )
+        return self.subscription_start <= date.today() <= self.subscription_end