Fix a couple of minor OAuthServer things

Summary:
I was a bit hasty with this.

  - This should be uninstallable.
  - Provide a real description.
  - Choose a better title glyph (trident of neptune).

Test Plan: Poked around.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: aran, epriestley

Differential Revision: https://secure.phabricator.com/D8534

src/applications/oauthserver/application/PhabricatorApplicationOAuthServer.php

@@ -15,21 +15,17 @@ final class PhabricatorApplicationOAuthServer extends PhabricatorApplication {
   }
 
   public function getTitleGlyph() {
-    return "~";
+    return "\xE2\x99\x86";
   }
 
   public function getFlavorText() {
-    return pht('yerps');
+    return pht('Login with Phabricator');
   }
 
   public function getApplicationGroup() {
     return self::GROUP_UTILITIES;
   }
 
-  public function canUninstall() {
-    return false;
-  }
-
   public function isBeta() {
     return true;
   }