find_account: Do not place Realm objects into context.

templates/zerver/emails/find_team.txt

@@ -9,7 +9,7 @@
 
 
 {% for realm in realms %}
-* {{ realm.name }}: {{ realm.url }}
+* {{ realm[0] }}: {{ realm[1] }}
 {% endfor %}
 
 {% trans %}If you have trouble logging in, you can reset your password.{% endtrans %}

zerver/views/registration.py

@@ -1546,7 +1546,7 @@ def find_account(request: HttpRequest) -> HttpResponse:
                 key = user.delivery_email.lower()
                 context.setdefault(key, {})
                 context[key].setdefault("realms", [])
-                context[key]["realms"].append(user.realm)
+                context[key]["realms"].append([user.realm.name, user.realm.url])
                 # This value will end up being the last user ID among
                 # matching accounts; since it's only used for minor
                 # details like language, that arbitrary choice is OK.