The ornamental design for a wastereceptacle, as shown and described.
FIG. 1 provides a front perspective view of a waste receptacle.
FIG. 2 provides a front view of a waste receptacle.
FIG. 3 provides a rear view of a waste receptacle.
FIG. 4 provides a left side view of a waste receptacle.
FIG. 5 provides a right side view of a waste receptacle; and,
FIG. 6 provides a top view of a waste receptacle.
The broken line showing of decorative cutouts and the inner can is included for the purpose of illustrating portions of the waste receptacle and forms no part of the claimed design.