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st/mesa: use roundf instead of floorf for lod-bias rounding

Erik Faye-Lund requested to merge d3d12-lod_bias_roundf into msclc-d3d12

There's no good reason not to use a symmetric rounding mode here. This fixes the following GL CTS case for me:

GTF-GL33.gtf21.GL3Tests.texture_lod_bias.texture_lod_bias_all

Fixes: 132b69c4 ("st/mesa: round lod_bias to a multiple of 1/256")

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