Image gallery block: Change to switchbox (Bug #1431569)

Change the checkbox to a switchbox.

Change-Id: I38b52d6dd785cd456ab8b094f0269df2965ca546
Signed-off-by: Kristina D.C. Hoeppner <kristina@catalyst.net.nz>

htdocs/artefact/file/blocktype/gallery/lib.php

@@ -588,7 +588,7 @@ class PluginBlocktypeGallery extends PluginBlocktype {
                 'separator' => '<br>',
             ),
             'showdescription' => array(
-                'type'  => 'checkbox',
+                'type'  => 'switchbox',
                 'title' => get_string('showdescriptions', 'blocktype.file/gallery'),
                 'description' => get_string('showdescriptionsdescription', 'blocktype.file/gallery'),
                 'defaultvalue' => !empty($configdata['showdescription']) ? true : false,