The ornamental design for a suncatcher display cabinet, as shown and described.
FIG. 1 is a perspective view of a suncatcher display cabinet embodying my design, the broken lines representing trim are for illustrative purposes only and form no part of the claimed design;
FIG. 2 is a front elevational view of the suncatcher display cabinet;
FIG. 3 is a right side elevational view of the suncatcher display cabinet, with the left side elevational view being a mirror image thereof;
FIG. 4 is a rear elevational view of the suncatcher display cabinet; and,
FIG. 5 is a top plan view of the suncatcher display cabinet.