Minor touchup to Paste Embed UI

Summary: Consolidate colors / spacing.

Test Plan:
Test embedding a paste, a list of pastes, and a PasteView for new colors, space.

{F321622}

{F321623}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11896

src/applications/paste/view/PasteEmbedView.php

@@ -5,7 +5,7 @@ final class PasteEmbedView extends AphrontView {
   private $paste;
   private $handle;
   private $highlights = array();
-  private $lines = 30;
+  private $lines = 24;
 
   public function setPaste(PhabricatorPaste $paste) {
     $this->paste = $paste;