UI: fixes link from to show page from entity policies list

[hellobontempo]

this PR previously addressed a capabilities issue in the show template, but we decided to approach the solution another day and get to the root of the problem (rather than supply a bandaid fix)

[zofskeez]

Thanks! I wonder how this worked in the first place if the model was being unloaded on route change by that mixin? Maybe something changed in the run loop timing or something in the new version.

[zofskeez]

A few policy tests are failing but I'm guessing they just need to be updated to have this.capabilities.isLoaded returning true.

[hellobontempo]

A few policy tests are failing but I'm guessing they just need to be updated to have this.capabilities.isLoaded returning true.

It ended up being more complicated than that...updated the template so that tests pass.

I'm not sure if changing the capabilities check from this.capabilities.canDelete to this.model.canDelete etc has far-reaching consequences? The capability model seemed to be what was causing the problem...

Reviewing new changes

[zofskeez]

I'm not familiar with the capabilities model but it looks to me like using lazyCapabilities on the policy model itself is more appropriate. It might be a good idea to get another set of eyes on this just to be sure.