Give Maniphest a title glyph

Summary:
Ref T7055. Apparently we just never had one? I feel like I'm crazy. But I can't find any trace in the logs.

I'm actually not 100% sold on this being better because it's a color glyph on OSX and those feel a little out of place / tacky to me compared to the black-and-white ones. So I'd be fine with just leaving it off, too. Clearly not important if no one noticed it until I caught it in T7055.

Test Plan: {F276917}

Reviewers: chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T7055

Differential Revision: https://secure.phabricator.com/D11524

src/applications/maniphest/application/PhabricatorManiphestApplication.php

@@ -22,6 +22,10 @@ final class PhabricatorManiphestApplication extends PhabricatorApplication {
     return 'fa-anchor';
   }
 
+  public function getTitleGlyph() {
+    return "\xE2\x9A\x93";
+  }
+
   public function isPinnedByDefault(PhabricatorUser $viewer) {
     return true;
   }