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