Bug 1719491: Escape string for default license

Which is only the user's name

Change-Id: I01d3dab89c0f48b6b734b31690f1b4036c7cf7a6
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
(cherry picked from commit 974728dd)

htdocs/lib/license.php

@@ -281,7 +281,7 @@ function render_license($artefact) {
             $copyrightholder = $licensor;
         }
         else {
-            $copyrightholder = $artefact->display_owner();
+            $copyrightholder = hsc($artefact->display_owner());
         }
 
         if ($licensorurl) {