The ornamental design for an incenseholder, as shown and described.
FIG. 1 is a perspective view of an incense holder, illustrating our new design;
FIG. 2 is a front elevational view of the incense holder of FIG. 1, the incense holder being symmetrical such that the rear, left, and right sides are mirror images of the front;
FIG. 3 is a top plan view of the incense holder of FIG. 1; and,
FIG. 4 is a bottom plan view of the incense holder of FIG. 1.
The structure illustrated in FIG. 1 with broken lines is environmental structure that forms no part of the claim.