Update class-cpt-wplf-submission.php

When viewing submissions, the 'All forms' filter dropdown was empty. Adding an 'echo' fixed that.

Author: hencca

classes/class-cpt-wplf-submission.php

@@ -143,7 +143,7 @@ function form_filter_dropdown() {
     <option
       value="<?php echo intval( $form->ID ); ?>"
       <?php echo isset( $_REQUEST['form'] ) && intval( $_REQUEST['form'] ) === $form->ID ? 'selected' : ''; ?>
-    ><?php esc_html( $form->post_title ); ?></option>
+    ><?php echo esc_html( $form->post_title ); ?></option>
   <?php endforeach; ?>
 </select>
 <?php