Adding tab specific class

Allow targeting specific tab with a class instead of id.

templates/single-product/tabs/tabs.php

@@ -39,7 +39,7 @@ if ( ! empty( $tabs ) ) : ?>
 			<?php endforeach; ?>
 		</ul>
 		<?php foreach ( $tabs as $key => $tab ) : ?>
-			<div class="panel entry-content wc-tab" id="tab-<?php echo esc_attr( $key ); ?>">
+			<div class="panel entry-content wc-tab tab-<?php echo esc_attr( $key ); ?>" id="tab-<?php echo esc_attr( $key ); ?>">
 				<?php call_user_func( $tab['callback'], $key, $tab ); ?>
 			</div>
 		<?php endforeach; ?>