{{model}} in route templates should be transformed to {{@model}}

[jelhan]

{{model}} in route templates is transformed to {{this.model}} but should be {{@model}} in my opinion. At least if ember-source is >= 3.14 and if the backing controller does not have a model property.

[rwjblue]

The issue with this is that @model will not match / handle special handling that folks have done in setupController (and therefore make the codemod less safe).