Bug 40370: (QA follow-up) Change raw filter to html

The diff doesn't contain intentional HTML formatting, and pre tags do
not prevent un-escaped HTML from being interpreted, so we should not
use the raw filter here

Signed-off-by: Emily Lamancusa <emily.lamancusa@montgomerycountymd.gov>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/en/modules/about.tt

@@ -806,7 +806,7 @@
         </div>
         [% IF db_audit.diff_found %]
             <div>
-                <pre><code>[% db_audit.diff | $raw %]</code></pre>
+                <pre><code>[% db_audit.diff | html %]</code></pre>
             </div>
         [% END %]
     [% END # tab=database %]