FIG. 1 is a perspective view of the container for a dispenser incorporating the ornamental design; FIG. 2 is a front view thereof; the side opposite is a mirror image; FIG. 3 is a top view thereof; FIG. 4 is a perspective view thereof; FIG. 5 is a side view thereof; the side opposite is a mirror image; and, FIG. 6 is a bottom view thereof. The broken lines are for illustrative purposes only and form no part of the claimed design.