Replace all "setQueryParam()" calls with "remove/replaceQueryParam()"

Summary: Ref T13250. See D20149. Mostly: clarify semantics. Partly: remove magic "null" behavior.

Test Plan: Poked around, but mostly just inspection since these are pretty much one-for-one.

Reviewers: amckinley

Reviewed By: amckinley

Subscribers: yelirekim

Maniphest Tasks: T13250

Differential Revision: https://secure.phabricator.com/D20154

src/applications/project/controller/PhabricatorProjectDefaultController.php

@@ -54,7 +54,7 @@ final class PhabricatorProjectDefaultController
     $view_uri = $this->getApplicationURI("board/{$id}/");
     $view_uri = new PhutilURI($view_uri);
     foreach ($request->getPassthroughRequestData() as $key => $value) {
-      $view_uri->setQueryParam($key, $value);
+      $view_uri->replaceQueryParam($key, $value);
     }
 
     if ($request->isFormPost()) {