The ornamental design for an electronic surfacesanitizer, as shown and described.
FIG. 1 is a front view of an electronic surface sanitizer;
FIG. 2 is a front perspective view thereof with a standoff connected;
FIG. 3 is a top view thereof with the standoff connected;
FIG. 4 is a back view thereof, with the standoff removed;
FIG. 5 is a first side view thereof with the standoff connected;
FIG. 6 is a second side view thereof with the standoff connected; and,
FIG. 7 is the first side view thereof without the standoff.
The broken lines showing the standoff illustrate environmental subject matter that forms no part of the claimed design. The broken lines on the dome in FIGS. 1-2 depict surface ornamentation that forms no part of the claimed design. The remaining broken lines depict portions of the electronic surface sanitizer that form not part of the claimed design.