Map color for mud brick slab is no longer consistent with map color for other mud brick blocks

The bug

Due to the fix of MC-249174, the map color for mud bricks, mud brick walls, and mud brick stairs has changed. However, the map color for mud brick slabs has not changed accordingly, meaning the mud brick slab map color is different than the map color for all other mud brick blocks.

To reproduce

1. Obtain and fill a map
2. Place mud bricks, mud brick stairs, and mud brick walls
   The map colors match
3. Place mud brick slabs
   The map color does not match with the other mud brick blocks placed

Expected behavior

The map color for the mud brick slab would match with the map colors of the other mud brick blocks.