replace all mt- to sad-

inc/metaboxes/mt-post-sidebar-meta.php

@@ -1,4 +1,4 @@
-<?php
+<?php
 /**
  * Functions for rendering meta boxes in post/page
  * 
@@ -78,7 +78,7 @@ function sophia_after_dark_sidebar_callback( $post ) {
     // Create our nonce field.
     wp_nonce_field( 'sophia_after_dark_nonce_' . basename( __FILE__ ) , 'sophia_after_dark_sidebar_layout_nonce' );
     ?>
-        <div class="mt-meta-options-wrap">
+        <div class="sad-meta-options-wrap">
             <div class="buttonset">
                 <?php foreach ( $sophia_after_dark_page_sidebar_option as $field ) { ?>
                         <input type="radio" id="<?php echo esc_attr( $field['id'] ); ?>" value="<?php echo esc_attr( $field['value'] ); ?>" name="sophia_after_dark_post_sidebar_layout" <?php checked( $field['value'], $post_sidebar_layout ); ?> />