Fix some typespecs

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

lib/mobilizon/events/event.ex

@@ -43,10 +43,10 @@ defmodule Mobilizon.Events.Event do
           description: String.t(),
           ends_on: DateTime.t(),
           title: String.t(),
-          status: EventStatus.t(),
+          status: atom(),
           draft: boolean,
-          visibility: EventVisibility.t(),
-          join_options: JoinOptions.t(),
+          visibility: atom(),
+          join_options: atom(),
           publish_at: DateTime.t() | nil,
           uuid: Ecto.UUID.t(),
           online_address: String.t() | nil,

lib/mobilizon/events/events.ex

@@ -442,7 +442,7 @@ defmodule Mobilizon.Events do
 
   @spec list_organized_events_for_group(
           Actor.t(),
-          EventVisibility.t() | :all,
+          atom(),
           DateTime.t() | nil,
           DateTime.t() | nil,
           integer | nil,

lib/mobilizon/events/participant.ex

@@ -16,7 +16,7 @@ defmodule Mobilizon.Events.Participant do
 
   @type t :: %__MODULE__{
           id: String.t(),
-          role: ParticipantRole.t(),
+          role: atom(),
           code: String.t(),
           url: String.t(),
           event: Event.t(),