The ornamental design for a burnerplate, as shown and described.
FIG. 1 is a front perspective view of a burner plate showing our new design;
FIG. 2 is a front view thereof; and,
FIG. 3 is an enlarged cross-sectional view taken along line 3-3 of FIG. 2.
The features shown in broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. The dash-dotted lines define the boundaries of the claimed design and form no part thereof.