Modernize DifferentialInlineCommentQuery

Summary:
Ref T7447. This class is currently a big mess with a lot of `withWeirdSpecialThingUsedInOnePlace()` type qualifiers.

Try to generalize/normalize it a bit.

Test Plan:
- Viewed inline comments.
- Created a new inline comment.
- Edited an inline comment.
- Marked an inline comment complete.
- Deleted, then undeleted an inline comment.
- Previewed inline comments.
- Viewed drafts as another user, verified they don't show up.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: yelirekim, epriestley

Maniphest Tasks: T7447

Differential Revision: https://secure.phabricator.com/D12483

src/applications/differential/controller/DifferentialChangesetViewController.php

@@ -287,7 +287,8 @@ final class DifferentialChangesetViewController extends DifferentialController {
     }
 
     return id(new DifferentialInlineCommentQuery())
-      ->withViewerAndChangesetIDs($author_phid, $changeset_ids)
+      ->setViewer($this->getViewer())
+      ->withChangesetIDs($changeset_ids)
       ->execute();
   }