Fix registering new user account with same email as unconfirmed

Refactors get_user_by_email/2

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mix/tasks/mobilizon/create_bot.ex

@@ -16,7 +16,7 @@ defmodule Mix.Tasks.Mobilizon.CreateBot do
   def run([email, name, summary, type, url]) do
     start_mobilizon()
 
-    with {:ok, %User{} = user} <- Users.get_user_by_email(email, true),
+    with {:ok, %User{} = user} <- Users.get_user_by_email(email, activated: true),
          actor <- Actors.register_bot(%{name: name, summary: summary}),
          {:ok, %Bot{} = bot} <-
            Actors.create_bot(%{