The ornamental design for an aglet, as shown and described.
FIG. 1 is a bottom isometric view of an aglet showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The line shading at the top and bottom surfaces of the the aglet depicts a flat surface. The broken line showing of the center bottom region of the aglet is for environmental purposes only and forms no part of the claimed design.