The ornamental design for a wallplate, as shown and described.
FIG. 1 is a perspective view of a wall plate according to the present design;
FIG. 2 is a front elevation view of the wall plate of FIG. 1;
FIG. 3 is a rear elevation view of the wall plate of FIG. 1;
FIG. 4 is a left side elevation view of the wall plate of FIG. 1;
FIG. 5 is a right side elevation view of the wall plate of FIG. 1;
FIG. 6 is a top plan view of the wall plate of FIG. 1; and,
FIG. 7 is a bottom plan view of the wall plate of FIG. 1.
The broken lines in the drawings are for the purpose of illustrating portions of the wall plate that form no part of the claimed design. No claim is made to the texture or surface finish of the embodiments shown in the figures.