In the modern era of user-customizable Quick Access sidebars on every file
dialog, navigating via `.lnk` files is considerably less useful than it
was twenty years ago.
Disable link-following in file-open dialogs by default, to prevent any of
the usual security issues involving symlink smuggling.
Allow overriding this behavior via a pref, for users who want to trade off
this security issue for convenience of being able to follow links inside
file dialogs (older OSes and established user workflows).
Note: File Save dialogs have a set of more nuanced guards against link
smuggling and protected file access; this change doesn't affect that.