Updated colors of tile items 121-131 to match map colors.

130 Active Stone Block is #FF808080 on the map to prevent obvious detection of traps. For the editor it obviously needs to be easily discernible, so I kept it brighter than both 1 Stone and 38 Gray Brick, but slightly reduced it from #FFA5A5A5 to #FFA0A0A0 to keep the luminance a multiple of 16. OCD is a terrible thing. ;)