BoxControl: Fix `aria-valuetext` value #123138

Job	Run time
Build JavaScript assets for PHP unit tests	1m 11s
Compute previous WordPress version	3s
JavaScript (Node.js 20) 1/4	1m 11s
JavaScript Date Tests (Node.js 20)	36s
JavaScript (Node.js 20) 2/4	1m 10s
JavaScript (Node.js 20) 3/4	1m 11s
JavaScript Date Tests (Node.js 22)	41s
JavaScript (Node.js 20) 4/4	1m 12s
JavaScript (Node.js 22) 1/4	1m 11s
Mobile	1m 12s
JavaScript (Node.js 22) 2/4	1m 11s
JavaScript (Node.js 22) 3/4	1m 10s
PHP coding standards	17s
JavaScript (Node.js 22) 4/4	1m 10s
PHP ${{ matrix.php }}${{ ((matrix.multisite && ' multisite') \|\| '') }}${{ (((matrix.wordpress != '') && format(' (WP {0}) ', matrix.wordpress)) \|\| '') }} on ubuntu-latest	1s
PHP	1s
	13m 28s

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