The ornamental design for an amenitytray, as shown and described.
FIG. 1 is a perspective view of an amenity tray showing my design thereof;
FIG. 2 is a top view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a back view thereof; and,
FIG. 7 is a bottom view thereof.
In the drawings, the broken lines showing a rectangular opening in the top border of the amenity tray are for illustrative purposes and form no part of the claimed design.