dinput: Reset device state in SysKeyboard*Impl_Acquire.

[Sebastian Lackner]

The tests are skipped on some Windows VMs, but it should be sufficient
to show that this is the correct behaviour.

Fixes: https://bugs.winehq.org/show_bug.cgi?id=11607

---
 dlls/dinput/keyboard.c       | 27 +++++++++++++++++++++++++--
 dlls/dinput/tests/keyboard.c | 20 ++++++++++++++++++++
 2 files changed, 45 insertions(+), 2 deletions(-)
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