The ornamental design for an electronic windinstrument, as shown and described.
FIG. 1 is a perspective view of the front, top and right side of an electronic wind instrument showing my new design;
FIG. 2 is a perspective view of the rear, top and left side thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken line showing of the electronic wind instrument is included for the purpose of illustrating portions of the electronic wind instrument and forms no part of the claimed design.