The ornamental design for a deskcanopy, as shown and described.
FIG. 1 is a left rear perspective view of a desk canopy showing my new design;
FIG. 2 is a rear plan view thereof;
FIG. 3 is a side plan view, the opposite side being a mirror image thereof;
FIG. 4 is an front plan view thereof; and,
FIG. 5 is a right front perspective thereof.
The broken lines depicting additional furniture portions in FIGS. 1–5 represent environmental elements only and form no part of the claimed design. The views of the desk canopy not shown form no part of the claimed design.