Update ajax.tickets.php

Fix translation so it makes sense.
Before: "Unable to change status for 2 any of the selected tickets" - sounds wired
After: "Unable to change status of 2 selected tickets" - sounds correct and fits into the rest of the translation scheme ;)

include/ajax.tickets.php

@@ -1024,7 +1024,7 @@ class TicketsAjaxAPI extends AjaxController {
             if (!$i) {
                 $errors['err'] = $errors['err']
                     ?: sprintf(__('Unable to change status for %s'),
-                        _N('the selected ticket', 'any of the selected tickets', $count));
+                        _N('selected ticket', 'selected tickets', $count));
             }
             else {
                 // Assume success