dinput: Remove error-prone new joystick code

[Bassi, Gurmail]

The joystick code I submitted in Wine patch 95617 seems to be causing problems to some users with both hardware (Wacom Cintiq) and software (Lord of the Rings Online) - see Wine bugs 33496 & 33593

This patch removes the offending code, until the cause can be fully investigated and a new patch issued if necessary
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