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We're going to be using NN scaling for the map, and that's already handled automatically by SDL (and in the future, OGL). We don't need these settings for surface SCALED_TO_ZOOM and SCALED_TO_HEX scaling. In any case, if we want to scale a surface to zoom or hex, it will almost certainly be for map rendering (such scaling methods don't make sense in the UI, for example), so just defaulting to NN is simplest. This change drops the option to use Linear or xBRZ scaling for map zooming. This was already the practical case due to me converting map rendering to use textures. NN was used for all zoom levels, and it's fast and looks good.