Revert "dix: Work around non-premultiplied ARGB cursor data harder"

This reverts commit b45c74f0.

It broke the cursor in other games. Apparently those use cursor data with premultiplied alpha, but with some pixels having r/g/b values larger than the alpha value (which corresponds to original r/g/b values > 1.0), triggering the workaround.

Seems the cure turned out worse than the disease, so revert.


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