We claim the ornamental design for an electronic device, as shown and described.
FIG. 1 is a rear perspective view of an electronic device, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is an enlarged view of the encircled portion A shown in FIG. 2; and,
FIG. 9 is an enlarged view of the encircled portion B shown in FIG. 2.
The broken lines in the figures show portions of the electronic device which form no part of the claimed design. The dot-dash broken lines in the figures represent an unclaimed boundary line and form no part of the claimed design. The dot-dot-dash broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design.