The ornamental design for a palmrest, as shown and described.
FIG. 1 is a top view of the palm rest design of the present invention;
FIG. 2 is a side view of the palm rest design of the present invention;
FIG. 3 is a bottom view of the palm rest design of the present invention;
FIG. 4 is a front view of the palm rest design of the present invention;
FIG. 5 is a front-top-side view of the palm rest design of the present invention; and,
FIG. 6 is a rear-top-side view of the palm rest design of the present invention thereof.
The broken line showing of a registered trademark is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.