Show onboarding unless invitation present

Fixes #1421

app/controllers/onboardings_controller.rb

@@ -19,6 +19,6 @@ class OnboardingsController < ApplicationController
     end
 
     def load_invitation
-      @invitation = Invitation.accepted.most_recent_for_email(Current.user.email)
+      @invitation = Current.family.invitations.accepted.find_by(email: Current.user.email)
     end
 end

app/models/invitation.rb

@@ -12,7 +12,6 @@ class Invitation < ApplicationRecord
 
   scope :pending, -> { where(accepted_at: nil).where("expires_at > ?", Time.current) }
   scope :accepted, -> { where.not(accepted_at: nil) }
-  scope :most_recent_for_email, ->(email) { where(email: email).order(accepted_at: :desc).first }
 
   def pending?
     accepted_at.nil? && expires_at > Time.current