The ornamental design for a wallplate, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a wall plate showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side view thereof, the opposite side being a mirror image of the side shown;
FIG. 4 is a front elevational view of a second embodiment thereof; and,
FIG. 5 is a front elevational view of a third embodiment thereof.
The broken line showing of the surface features FIGS. 4 and 5 is included for the purpose of illustrating environmental structure and forms no part of the claimed design.
The portions of the wall plate not shown in drawings form no part of the claimed design.