The ornamental design for a handdryer, as shown and described.
FIG. 1 is a perspective of the hand dryer design from below and to the right side.
FIG. 2 is a direct, front-view perspective of the hand dryer design.
FIG. 3 is a side-view of the hand dryer design.
FIG. 4 is a top-down view of the hand dryer design; and,
FIG. 5 is a bottom-up view of the hand dryer design.
Shading, broken lines, or cross-hatching are not features of the design but are used to illustrate the surface contours of the hand dryer design in the drawings.
The broken lines on the rear of the hand dryer shown in the drawing are for illustrative purposes only and form no part of the claimed design.