The ornamental design for a confection, as shown and described.
FIG. 1 is a front perspective view of a confection showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevation view thereof; and,
FIG. 4 is a bottom plan view thereof.
The broken line showing of a cup is for purpose of illustrating environment, and forms no part of the claimed design. The different shadings shown in FIGS. 1-4 represent contrasting appearances.