Fix #3430: Accept the search[id] param in all controllers.

* Allow every controller to take the `search[id]` param.

* Parse the `search[id]` param the same way that the `id:<N>` metatag is
  parsed. So `search[id]=1,2,3`, `search[id]=<42`, `search[id]=1..10`, for
  example, are all accepted.

app/models/note.rb

@@ -42,7 +42,7 @@ class Note < ApplicationRecord
     end
 
     def search(params)
-      q = where("true")
+      q = super
       return q if params.blank?
 
       if params[:body_matches].present?