The ornamental design for an electricgriddle, as shown and described.
FIG. 1 is a perspective view of an electric griddle;
FIG. 2 is a top view of the electric griddle;
FIG. 3 is a front view of the electric griddle;
FIG. 4 is a right side view of the electric griddle; and,
FIG. 5 is a left side view of the electric griddle.
The dash broken lines shown in the drawings are for purposes of illustrating portions of the electric griddle that form no part of the claimed design. In connection with the electric griddle, the rear portion and bottom portion of the electric griddle are nut visible during ordinary use and form no part of the claimed design.