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OpenGX might have set the GPU to perform Z-buffering, triangle culling and alpha compare in such a way that our mouse cursor will not be drawn. For that reason, reset them to ensure that our cursor will always be drawn. Extra care must be put to restore these registers to the same state in which SDL had set them before, in order not to break 2D applications.
Applications not explicitly requesting a mouse cursor don't have any benefit in rendering the default cursor when the wiimote is not pointed at the screen; on the contrary, the wiimote might be held sideways, and the cursor would just be disturbing.
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To be reviewed after !84