The ornamental design for a lighter, as shown and described.
FIG. 1 is a bottom, right-side perspective view of a lighter showing my new design;
FIG. 2 is a right-side elevational view of the lighter shown in FIG. 1;
FIG. 3 is a left-side elevational view of the lighter shown in FIG. 1;
FIG. 4 is a bottom elevational view of the lighter shown in FIG. 1;
FIG. 5 is a top elevational view of the lighter shown in FIG. 1;
FIG. 6 is a front plan view of the lighter shown in FIG. 1; and,
FIG. 7 is a rear plan view of the lighter shown in FIG. 1.
The broken lines showing portions of the lighter are for the purpose of illustrating environmental structure only and form no part of the claimed design.