I claim the ornamental design for the retail display cable, as shown and described.
FIG. 1 is a perspective view of the retail display cable:
FIG. 2 is another perspective view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is another side view thereof, showing the side opposite that shown in FIG. 3;
FIG. 5 is a top view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a back view thereof.
The retail display cable is shown with a symbolic break in its length, represented by a break line. The appearance of any portion of the article between the break lines forms no part of the claimed design.