fixes #7608 - Override all puppetclass parameters in one click

proposed patch for #7608 adding a link on the puppetclasses page to set all parameters of the selected class to overriden
While I understand why you did this, please just leave the method as

```ruby
puppetclass.class_params.present? && puppetclass.class_params.map(&:override).all? 
```
That will return true if all parameters are overridden and false if they are not overridden or they don't exist. Return codes are not commonly used in this code base for this kind of events and ```method?``` are expected to return true or false in idiomatic Ruby.