Move data transformation into the form

Follows what we’re doing with the folders stuff. Avoids having too many
very straightforward methods on the model. Especially when the data they
need is only used by the form. So it’s better to encapsulate the logic
in the form.

app/main/views/api_keys.py

@@ -87,7 +87,7 @@ def api_keys(service_id):
 @login_required
 @user_has_permissions('manage_api_keys', restrict_admin_usage=True)
 def create_api_key(service_id):
-    form = CreateKeyForm(current_service.api_key_names)
+    form = CreateKeyForm(current_service.api_keys)
     form.key_type.choices = [
         (KEY_TYPE_NORMAL, 'Live – sends to anyone'),
         (KEY_TYPE_TEAM, 'Team and whitelist – limits who you can send to'),