The ornamental design for a commodechairseat, as shown and described.
FIG. 1 is a perspective view of the commode chair seat. FIG. 2 is a top
plan view of the commode chair seat. FIG. 3 is a bottom plan view of the
commode chair seat. FIG. 4 is a front elevation view of the commode chair
seat. FIG. 5 is a back elevation view of the commode chair seat; and, FIG.
6 is a side elevation view of the commode chair seat.