(resend)server: Do not replace focus and active windows with NULL on thread_attach_input

[Aric Stewart]

Update to correct issues pointed out by Sebastian Lackner
---
 dlls/user32/tests/input.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++
 dlls/user32/tests/msg.c   |   3 +-
 server/queue.c            |  12 ++++-
 3 files changed, 146 insertions(+), 3 deletions(-)


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