[WINED3D] Lights: Maintain doubly linked list

[Ivan Gyurdiev]

I didn't run into any specific problems, but noticed this while 
investigating another issue. The stateblock contains a doubly-linked 
list of lights. The backward link isn't maintained properly in recording 
mode in SetLight and SetLightEnable. Nothing good can come out of that - 
fix it so it doesn't cause any issues in the future.


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