Update page-header.php

This was always kind of strange to me, everything else seems to be preferred to be on a single line.

templates/page-header.php

@@ -1,7 +1,5 @@
 <?php use Roots\Sage\Titles; ?>
 
 <div class="page-header">
-  <h1>
-    <?= Titles\title(); ?>
-  </h1>
+  <h1><?= Titles\title(); ?></h1>
 </div>