The ornamental design for a wallplateshield, as shown and described.
FIG. 1 is a front perspective view of a wall plate shield.
FIG. 2 is a front view of the wall plate shield of FIG. 1.
FIG. 3 is a rear view of the wall plate shield of FIG. 1.
FIG. 4 is a left side view of the wall plate shield of FIG. 1.
FIG. 5 is a right side view of the wall plate shield of FIG. 1.
FIG. 6 is a top view of the wall plate shield of FIG. 1; and,
FIG. 7 is a bottom view of the wall plate shield of FIG. 1.
The details shown in even broken lines are for illustrative purposes only and form no part of the claimed design. The dash-dot broken lines represent boundaries of unclaimed portions of the claimed design and form no part of the claimed design.