Rubocop updates (#1118)

* Minimal code style enforcement

* Formatting and lint code updates (no change in functionality)

app/models/concerns/monetizable.rb

@@ -1,14 +1,14 @@
 module Monetizable
-    extend ActiveSupport::Concern
+  extend ActiveSupport::Concern
 
-    class_methods do
-      def monetize(*fields)
-        fields.each do |field|
-          define_method("#{field}_money") do
-            value = self.send(field)
-            value.nil? ? nil : Money.new(value, currency || Money.default_currency)
-          end
+  class_methods do
+    def monetize(*fields)
+      fields.each do |field|
+        define_method("#{field}_money") do
+          value = self.send(field)
+          value.nil? ? nil : Money.new(value, currency || Money.default_currency)
         end
       end
     end
+  end
 end