Bug 1820912: Do not show retraction on blocks exported to HTML

We just want retracted blocks to display as non-retracted

behatnotneeded

Change-Id: I30a10f99784fc33c459a551f8c9b93ef890c5844
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/blocktype/lib.php

@@ -1238,7 +1238,7 @@ class BlockInstance {
         }
 
         $smarty->assign('content', $content);
-        if (isset($configdata['retractable']) && $title) {
+        if (isset($configdata['retractable']) && $title && !$exporting) {
             $smarty->assign('retractable', $configdata['retractable']);
             if (isset($configdata['retractedonload'])) {
                 $smarty->assign('retractedonload', $configdata['retractedonload']);