The ornamental design for a rotarydeskorganizer, as shown and described.
FIG. 1 is a front perspective view of a rotary desk organizer showing the new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a right side thereof; and,
FIG. 7 is a left side thereof.
The surfaces in broken lines in the drawings are included for the purpose of showing portions of the rotary desk organizer that form no part of the claimed design.