Change the loading order of unit database files #292

Job	Run time
Build MDANSE and run tests on ubuntu-20.04	3m 1s
Build MDANSE and run tests on ubuntu-20.04	3m 3s
Build MDANSE and run tests on ubuntu-20.04	2m 49s
Build MDANSE and run tests on ubuntu-20.04	3m 0s
Build MDANSE and run tests on windows-2019	4m 11s
Build MDANSE and run tests on windows-2019	4m 8s
Build MDANSE and run tests on windows-2019	3m 56s
Build MDANSE and run tests on windows-2019	6m 4s
Build MDANSE and run tests on macOS-11	5m 9s
Build MDANSE and run tests on macOS-11	5m 10s
Build MDANSE and run tests on macOS-11	6m 56s
Build MDANSE and run tests on macOS-11	6m 10s
	53m 37s

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