The ornamental design for a lightcover, as shown and described.
FIG. 1 is an isometric view of a light cover showing a design according to the present disclosure.
FIG. 2 is a front view of the design of FIG. 1, with the back and side views being identical.
FIG. 3 is a first end view of the design of FIG. 1; and,
FIG. 4 is a second end view of the design of FIG. 1.
The shading lines shown in the drawings, including radial and circumferential lines, represent the approximate three-dimensional contour of the claimed design and are not intended to indicate surface decoration. The dashed lines shown in the drawings indicate portions of the design that are not presently claimed, including the interior of the cover, and thus form no part of the presently claimed design.