The ornamental design for a hairstraightener, as shown and described.
FIG. 1 is a first perspective view of a hair straightener showing my design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown in the drawings depict portions of the hair straightener in which the design is embodied that form no part of the claimed design.