The ornamental design for a pedestaldesk, as shown and described.
FIG. 1 is a rear perspective view of a new and ornamental design for a pedestal desk, the drawer pulls, drawer locks, and horizontal grooves formed in the base all being illustrated in phantom lines for environmental purposes only and forming no part of the claimed invention;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a front elevation view thereof; and,
FIG. 6 is a side elevation view thereof, the opposite side being a mirror image thereof.