...after 6e32e575 "Resolves: tdf#103915 when
global dark theme is set fall back to breeze_dark".  No idea whether
bDarkIconTheme=false is the right choice in all three cases, but at least the
test succeeds that way.

Change-Id: I633c4ebff19a1d441baa8270d681a73c8f6c4aa0