The ornamental design for a nailpolisher, as shown and described.
FIG. 1 is a first perspective view of a nail polisher showing my new 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;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is an enlarged view of the selected portion 9 in FIG. 1.
The evenly spaced broken lines shown in the drawings depict portions of the nail polisher that form no part of the claimed design. The dash dot broken lines in the drawings depict the boundary of the enlarged portion shown in FIG. 9.