The ornamental design for the wine glass holder, as shown and described.
FIG. 1 is a perspective view of a wine glass holder showing my new design with wine glasses;
FIG. 2 is a top view of the wine glass holder;
FIG. 3 is a bottom view of the wine glass holder;
FIG. 4 is a left side view of the wine glass holder;
FIG. 5 is a right side view of the wine glass holder;
FIG. 6 is a front view of the wine glass holder;
FIG. 7 is a back view of the wine glass holder; and,
FIG. 8 is a front view of the wine glass holder with a wine glass.
The broken line showing of the wine glasses are for the purpose of illustrating the environment and boundary related to the claimed design and forms no part of the claimed design.