The ornamental design for a dispenserhead, as shown and described.
FIG. 1 is a top left side isometric view of a dispenser head in accordance with the new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in FIG. 7 represent the bounds of the claimed design, with the lines themselves and the areas within them forming no part of the claimed design.