[autotests] Try to detect whether distro calls cursor theme DMZ-White or Vanilla-DMZ
Some distributions (e.g. Arch, FreeBSD) call the DMZ-White cursor theme Vanilla-DMZ. Due to that our tests are failing even if the correct theme is installed (see also T6623). This change tries to detect whether DMZ-White is installed by looking into the GenericDataLocation. If not found we set to Vanilla-DMZ. No guarantee that the check works for all setups, but it's only tests...
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