FIX: better handling of invite links after they are redeemed

FIX: deprecate invite_passthrough_hours setting

app/models/invite_redeemer.rb

@@ -8,12 +8,6 @@ InviteRedeemer = Struct.new(:invite, :username, :name, :password, :user_custom_f
       end
     end
 
-    # If `invite_passthrough_hours` is defined, allow them to re-use the invite link
-    # to login again.
-    if invite.redeemed_at && invite.redeemed_at >= SiteSetting.invite_passthrough_hours.hours.ago
-      return get_existing_user
-    end
-
     nil
   end