tests

fix self-test problems in QtSLiM #1412

Job	Run time
tests-Windows-CLI (mingw64, x86_64, 3.8)	16m 50s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	5m 11s
canceller	4s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	17m 25s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	7m 37s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	6m 6s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 58s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	7m 29s
tests-Unix-GUI (ubuntu-22.04, 6.7.2, 12)	7m 32s
tests-Unix-CLI (macos-13, 3.9)	14m 39s
tests-Windows-GUI (mingw64, x86_64)	13m 28s
tests-Unix-GUI (macos-13, 5.15.2)	9m 28s
tests-Unix-CLI (macos-15, 3.9)	5m 26s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	13m 23s
tests-Unix-GUI (macos-15, 6.7.2)	4m 50s
tests-windows-latest-pacman (mingw64, x86_64)	1m 41s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 35s
	2h 19m 42s

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