InputCommon: Use the Window handle when initializing DirectInput. #8795
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Previously, when initializing the Win32 input layer (and as a result DirectInput), Dolphin would use the handle of the render widget, which isn't updated when
ControllerInterface::ChangeWindow
is called. This had the annoying side effect of making all mouse input to Dolphin on Windows relative to the main Dolphin window, not the actual render target or render window.This PR makes sure the Win32 controller interface is initialized using the actual window handle, which in turn makes mouse input relative to the render target itself, not the main window.