web: highlight email quotes in patch comments

Patch detail comments render their content as plain text, unlike
cover letter comments which use highlightMessage(). Apply the same
highlighting so that email quotes, trailers and diffstats are
properly colored.

Signed-off-by: Robin Jarry <robin@jarry.cc>

Author: rjarry

pkg/web/patch.templ

@@ -299,7 +299,9 @@ templ patchDetailPage(d patchDetailData) {
 						}
 					</comment-header>
 					if c.Content != nil {
-						<pre>{ *c.Content }</pre>
+						<pre>
+							@templ.Raw(highlightMessage(*c.Content))
+						</pre>
 					}
 				</article>
 			}