Apply suggestion from @westonruter

Co-authored-by: Weston Ruter <westonruter@gmail.com>

Author: huzaifaalmesbah

src/wp-admin/customize.php

@@ -288,7 +288,7 @@
 							$class .= ' active';
 						}
 						?>
-						<button type="button" class="<?php echo esc_attr( $class ); ?>" aria-pressed="<?php echo esc_attr( (string) $active ); ?>" data-device="<?php echo esc_attr( $device ); ?>">
+						<button type="button" class="<?php echo esc_attr( $class ); ?>" aria-pressed="<?php echo esc_attr( $active ? 'true' : 'false' ); ?>" data-device="<?php echo esc_attr( $device ); ?>">
 							<span class="screen-reader-text"><?php echo esc_html( $settings['label'] ); ?></span>
 						</button>
 					<?php endforeach; ?>