Osra197 show view on cancel edit

Feature specs and controller changes to get cancelling edit returning to show page for partner, orphan and sponsor.
Of the 3 scenarios, this one does the best job of concisely testing the functionality in question. However, I would shorten it further to focus exclusively on the 'Cancel' action:
```ruby
Given I am on the "Edit Partner" page for partner "Partner1"
And I fill in "Region" with "I Should Not See This"
And I click the "Cancel" button
Then I should be on the "Show Partner" page for partner "Partner1"
And I should not see "I Should Not See This"
```
(Also changing the value of the attribute to something extremely unlikely to be there in the first place.)
It would be good to refactor all the scenarios to use the fewest number of steps necessary.