The ornamental design for an electricdiffuser, as shown and described.
FIG. 1 is a front, top perspective view of an electric diffuser;
FIG. 2 is a rear, bottom perspective thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a side view thereof;
FIG. 6 is an opposite side view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown in the figures are for the purpose of illustrating unclaimed portions of the invention and boundaries only, and form no part of the claimed design.