The ornamental design for a lipstickcase, as shown and described.
FIG. 1 is a perspective view of a lipstick case showing the new design;
FIG. 2 is a perspective view of the lipstick case of FIG. 1, shown with the top removed to show aspects of the design not clearly visible when combined;
FIG. 3 is a front view of the lipstick case of FIG. 1;