Allow users to set whether or not textareas are monospaced.

Summary:
Some users like monospaced textareas and others don't.
This introduces an option to set this as a user preference.

Test Plan: Enabled and saw monospaced textareas, disabled and saw non-monospaced textareas.

Reviewers: epriestley

CC: aran, Korvin

Maniphest Tasks: T2114

Differential Revision: https://secure.phabricator.com/D4037

src/applications/phame/controller/blog/PhameBlogEditController.php

@@ -122,7 +122,7 @@ final class PhameBlogEditController
         ->setName('description')
         ->setValue($blog->getDescription())
         ->setID('blog-description')
-      )
+        ->setUser($user))
       ->appendChild(
         id(new AphrontFormPolicyControl())
           ->setUser($user)