The ornamental design for a lighter, as shown and described.
FIG. 1 is a front perspective view of a lighter, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof, the right side elevation view being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The evenly-sized, dot-dot-dot broken lines shown in the drawings depict portions of the lighter that form no part of the claimed design. The unevenly-sized, dot-dash-dot broken lines shown in the drawings depict the bounds of the claimed design, it being understood that the dot-dash-dot broken lines form no part of the claimed design.