The ornamental design for a volatilesubstancedispenser, as shown and described.
FIG. 1 is a perspective view of front the volatile substance dispenser;
FIG. 2 is an elevation view from the front of the volatile substance dispenser;
FIG. 3 is an elevation view from the back of the volatile substance dispenser;
FIG. 4 is an elevation view from the side of the volatile substance dispenser;
FIG. 5 is an elevation view from the opposite side of the volatile substance dispenser;
FIG. 6 is a plan view of the top of the volatile substance dispenser; and,
FIG. 7 is a plan view of the bottom of the volatile substance dispenser.
The broken lines showing of parts of the volatile substance dispenser shown in broken lines are for illustrative purposes only and form no part of the claimed design.