[4.0] mod_privacy_status layout field class missing

[infograf768]

Summary of Changes

Adding missing custom-select class to the layout field

Testing Instructions

Edit the mod_privacy_status module Advanced tab

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

[ChristineWk]

I have tested this item ✅ successfully on ee9bc27

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31406.}

[alikon]

I have tested this item ✅ successfully on ee9bc27

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31406.}

[alikon]

RTC

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31406.}

[chmst]

Thanks!