CORE-20447
Remove the `TVS_EDITLABELS` window style from the tree view control of the `SYSTEM.INI`/`WIN.INI` tabs, making the labels read-only as intended.
This prevents the UI from opening an editable text box when users click or pause on tree view items, which was misleading since editing/saving here is not implemented.
Users are still able to edit configurations using the dedicated "Edit" button on the UI.