The ornamental design for a wall mount bracket, as shown and described.
FIG. 1 is a top perspective view of our wall mount bracket showing our bracket fitted with screw openings as shown in phantom lines. The phantom lines in this FIG. 1 and in our FIG. 2 are for illustrative purposes only, and form no part of our new design invention.
FIG. 2 is a top plan view of our wall mount bracket with the undisclosed bottom view being flat and unornamented;
FIG. 3 is one side view of our new wall mount bracket, with the other side view being the same;
FIG. 4 is a bottom end view of our new wall mount bracket; and,
FIG. 5 is a top end view of our new wall mount bracket.