Quadlet - fix dropin overwrites if different parent dirs

[eulores]

fixes #26555

Does this PR introduce a user-facing change?

None

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[Luap99]

Thanks, I think a test case would be good so we don't regress in the future.
I don't see any existing tests that could extended for this @ygalblum do you have a idea what would be the best way to check this?I guess some new unit tests for loadUnitDropins() is needed?

[ygalblum]

Maybe add it as part of the system test:

podman/test/system/252-quadlet.bats

Line 1793 in 8234879

@test "quadlet - drop-in files" {