Remove dead strftime() call in worker calendar form

The strftime() result was immediately overwritten by a hardcoded
Hungarian month-name array. Drop the dead line so PHP 8.1+ stops
emitting an E_DEPRECATED warning when prod loads the worker calendar.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

application/views/admin/includes/worker-calendar-form.php

@@ -77,8 +77,6 @@
     $startOffset = ($startDow + 6) % 7;
 
     $today      = date('Y-m-d');
-    $monthLabel = strftime('%Y %B', $firstDay); // Hungarian month names via locale
-    // Fallback: PHP intl not guaranteed; build own table
     $monthNames = ['január','február','március','április','május','június','július','augusztus','szeptember','október','november','december'];
     $monthLabel = $year . ' ' . $monthNames[$month - 1];