The ornamental design for a benchseat, as shown and described.
FIG. 1 is a perspective view of a bench seat comprising our design;
FIG. 2 is a perspective view of a bench seat comprising our design;
FIG. 3 is a top plan view comprising our design;
FIG. 4 is a front elevation view comprising our design;
FIG. 5 is a bottom plan view comprising our design;
FIG. 6 is a rear elevation view comprising our design;
FIG. 7 is a left side elevation view comprising our design; and,
FIG. 8 is a right side elevation view comprising our design.
The broken line showing of the bench back and bench frame in FIG. 1 is included for the purpose of illustrating environmental structure and forms no part of the claimed design.