Fix HTML export template syntax

Angle brackets must be quoted when not part of an HTML tag.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

theme/dive_export.html

@@ -129,9 +129,9 @@ function changeAdvSearch(e){
 	</div>
 	<center>
 	<div id="controller">
-		<button onClick="prev_page()"><-</button>
+		<button onClick="prev_page()">&lt;-</button>
 		<span id="pagging"></span>
-		<button onClick="next_page()">-></button>
+		<button onClick="next_page()">-&gt;</button>
 	</div>
 	</center>
 	</div>