Don't call deprecated FileUtil::preventFileChooserSymlinkTraversal

[mbien]

Method is non-functional since java 6 and can be inlined as simple JFileChooser::setCurrentDirectory call. A code template used it too.

Reduces warning noise.

[matthiasblaesing]

I started looking through this and in many places the call to setCurrentDirectory is redundant. Redundant in this case means, that it is either implicitly set as a side effect of setSelectedFile or explicitly by invocations of setCurrentDirectory.

While it is good to remove the call to the "magic function" (preventFileChooserSymlinkTraversal), we get multiple calls to functions that do the same thing.

This is not a blocker, but I noticed it. The replacements themselfes look sane to me.

[mbien]

will do another pass since all sequences of:

     JFileChooser chooser = new JFileChooser();
     chooser.setCurrentDirectory(null);

are already redundant, since the user dir is the JFileChooser's default dir after construction.

[mbien]

using this PR to test if the PR label queries via the workflow expression language still work after #9227. Just a quick rebase.

edit: it worked

[mbien]

@matthiasblaesing ok to merge? I simplified it a bit by removing most of the calls entirely.

[matthiasblaesing]

Eyeballed this and looks sane to me.