Windows Camouflage automated tests sometimes failed due to differently ordered icons in the notification area

The expected WindowsSysTray.png has (from left to right): keyboard, OpenPGP, notifications (1), sound. I’ve just seen instead: keyboard, OpenPGP, sound, notifications (1). I guess we could look for keyboard and OpenPGP together, and then separately look for the sound icon. Not sure looking for the notifications icon is good, as depending on various races, there can be different numbers in there — if we do that, IMO we should not include the number of notifications in the expected image.

Feature Branch: test/8059-more-robust-windows-systray

Parent Task: #8539 (closed)

Original created by @intrigeri on 8059 (Redmine)