Remove data store accessor from ingredient base class

This was necessary before we started to use Rails' data store feature in
AlchemyCMS#2171

This currently leads to weird bugs around active record dirty falsy thinking
the attribute set is not dirty, leading
to the data store not being saved.

app/models/alchemy/ingredient.rb

@@ -118,11 +118,6 @@ def preview_text(maxlength = 30)
       value.to_s[0..maxlength - 1]
     end
 
-    # Cross DB adapter data accessor that works
-    def data
-      @_data ||= (self[:data] || {}).with_indifferent_access
-    end
-
     # The path to the view partial of the ingredient
     # @return [String]
     def to_partial_path