EmulatorPkg/Win: ReadKeyStrokeEx() always returns correct KeyState
EmulatorPkg/Win: ReadKeyStrokeEx() always returns correct KeyState

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1118

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <9fa3a6894a36bca79e6a72ad65af5a5702efecd1@intel.com>
Reviewed-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>
Cc: Andrew Fish <be8d29debaaf5173b4b7ecb4ace852732e71f7b9@apple.com>

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