FIG. 1 is a perspective view of a holder showing our new design. FIG. 2 is a front view thereof, a rear view being a mirror image of the front view. FIG. 3 is a left side view thereof, a right side view being a mirror image of the left side view. FIG. 4 is a top view thereof; and, FIG. 5 is a bottom view thereof. The broken lines in the drawings show unclaimed subject matter only and form no part of the claimed design.