The ornamental design for an adjustabledeskstand, as shown and described.
FIG. 1 is a perspective view of an adjustable desk stand in accordance with the present invention;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a perspective view, showing the adjustable desk stand in the desk; and,
FIG. 9 is another perspective view, showing the adjustable desk stand in the desk.
The broken line showing of the desk illustrates environment and form no part of the claimed design. The broken line showing of elements on the adjustable desk stand illustrates portions of the article and forms no part of the claimed design.