Correct the handle URI for build steps

Summary: Fixes T9674. This was wrong to start with (URI is `/edit/X/`, not `/X/edit/`) but we have a new view page anyway.

Test Plan:
  - Visited an exmaple URI in my browser.
  - Followed a build step link from "Authorized By: ..." in Drydock.

Reviewers: joshuaspence, chad

Reviewed By: chad

Maniphest Tasks: T9674

Differential Revision: https://secure.phabricator.com/D14366

src/applications/harbormaster/phid/HarbormasterBuildStepPHIDType.php

@@ -34,7 +34,7 @@ final class HarbormasterBuildStepPHIDType extends PhabricatorPHIDType {
       $handle
         ->setName($name)
         ->setFullName(pht('Build Step %d: %s', $id, $name))
-        ->setURI("/harbormaster/step/{$id}/edit/");
+        ->setURI("/harbormaster/step/view/{$id}/");
     }
   }