setupapi/tests: Try to delete pre-existing key

[André Hentschel]

Signed-off-by: André Hentschel <nerv at dawncrow.de>
---

The intention is to fix:
> devinst.c:463: Test failed: Expected key to not exist
> devinst.c:468: Test failed: Expected ERROR_INVALID_PARAMETER, got e0000207

e.g. from https://test.winehq.org/data/4bfefc5c7132023ee40d70572b677ae0e441df38/win10_cw1-hd6800-t64/setupapi:devinst.html

 dlls/setupapi/tests/devinst.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)


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