Fix map id.

module/templates/leaflet_map_html.html5

@@ -1,6 +1,6 @@
 <div id="<?php echo $mapId; ?>" style="<?php echo $style; ?>"></div>
 <script>
-L.contao.addMap('{$mapId}', function() {
+L.contao.addMap('<?php echo $mapId; ?>', function() {
 <?php echo $javascript; ?>
 return { map: map, layers: layers, controls: controls, icons: icons };
 }());</script>