The ornamental design for the bone plate, as shown and described.
FIG. 1 is a top perspective view of the bone plate comprising the new design;
FIG. 2 is a bottom perspective view of the design of FIG. 1;
FIG. 3 is a left elevational view of the design of FIG. 1;
FIG. 4 is a right elevational view of the design of FIG. 1;
FIG. 5 is a front elevational view of the design of FIG. 1;
FIG. 6 is a back elevational view of the design of FIG. 1;
FIG. 7 is a top view of the design of FIG. 1; and,
FIG. 8 is a bottom view of the design of FIG. 1.
The broken lines in the figures are directed to the environment and are for illustrative purposes only; the broken lines form no part of the claimed design.