Reorganize tools button menu for best user experience

Summary:
After 5206cdda2292, 7034b50c5c9e and 45c37a64e1cc were worked on in
parallel and added entries to the new Tools menu, it was necessary
to put them in the right order in the end.

The suggestion in D10542#207008 was met with approval, as
Open Screenshots Folder seems like an often used feature and
therefore belongs on top, and Record Screen is only slightly
related to the actual screenshot and thus can go at the bottom.

Ref T7841

Test Plan
Menu still works, same order as in planned docbook patch (see D10542).

Reviewers: Spectacle, gregormi, ngraham

Reviewed By: Spectacle, ngraham

Subscribers: ngraham

Maniphest Tasks: T7841

Differential Revision: https://phabricator.kde.org/D10561