The ornamental design for a platedispenser, as shown and described.
FIG. 1 is a front view of a plate dispenser showing my new design;
FIG. 2 is a rear view of the plate dispenser;
FIG. 3 is a right side view of the plate dispenser;
FIG. 4 is a left side view of the plate dispenser;
FIG. 5 is a top view of the plate dispenser;
FIG. 6 is a bottom view of the plate dispenser; and,
FIG. 7 is a top front side perspective view of the plate dispenser in use.
The broken lines in FIG. 6 immediately adjacent to the interior edge define a border forming no part of the claimed design. The broken lines in FIG. 7 define environmental structure forming no part of the claimed design.