We claim the ornamental design for an electronic device, as shown and described.
FIG. 1 is a front 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; and,
FIG. 7 is a bottom view thereof.
The thinner line weight broken lines shown in the figures represent environmental features which appear underneath the surface of the device and form no part of the claimed design. The thicker line weight broken lines shown in the figures illustrate portions of the electronic device which are for environmental purposes only and 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.