The ornamental design for a capsulebasket, as shown and described.
FIG. 1 is a front view thereof:
FIG. 2 is right side view and left side view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a perspective view thereof with objects drawn in dashed lines shown to provide proper context to the invention and are not part of the invention.