Change title and description type to HTML

[grappler]

For Swisscom we changed the type from plain to HTML. I am not sure if it makes sense here. If we make the change we have not make sure the content is entity-encoded.

We can close this issue and reopen later if there is need elsewhere.

diff --git a/classes/plugin.php b/classes/plugin.php
index 38c87f2..20809b1 100644
--- a/classes/plugin.php
+++ b/classes/plugin.php
@@ -176,7 +176,7 @@ class WP_Feed_Post_Thumbnail_Plugin {
                                height="<?php echo absint( $img_attr[2] ); ?>">
-                               <media:title type="plain">
+                               <media:title type="html">
                                        <![CDATA[<?php echo sanitize_text_field( $title ); ?>]]>
                                </media:title>
@@ -184,7 +184,7 @@ class WP_Feed_Post_Thumbnail_Plugin {
                                <?php if ( isset( $options['description'] ) && $options['description'] && ! empty( $description ) ) : ?>
-                                       <media:description type="plain"><![CDATA[<?php echo wp_kses_post( $description ); ?>]]></media:description>
+                                       <media:description type="html"><![CDATA[<?php echo wp_kses_post( $description ); ?>]]></media:description>
                                <?php endif; ?>