refactor: remove action hook for course thumbnail in course card template

Author: nur-alam

templates/dashboard/courses/course-card.php

@@ -26,7 +26,6 @@
 	<div class="tutor-card tutor-progress-card">
 
 		<div class="tutor-courses-thumb tutor-position-relative">
-			<?php do_action( 'tutor_my_courses_before_thumbnail', $course_id ); ?>
 
 			<?php if ( ! empty( $tutor_course_img ) ) : ?>
 				<div class="tutor-progress-card-thumbnail">