The ornamental design for a foldable discgolfcart, as shown and described.
1. Foldable disc golf cart
Fig. 1.1 is a perspective view of the foldable disc golf cart; fig. 1.2 is a front view thereof; fig. 1.3 is a back view thereof; fig. 1.4 is a right side view thereof; fig. 1.5 is a left side view thereof; fig. 1.6 is a top view thereof; fig. 1.7 is a bottom view thereof.