The ornamental design for a discgolfgoaladapter, as shown and described.
FIG. 1 is a top perspective view of the disc golf goal adapter showing my new design together with broken lines representing its environment;
FIG. 2 is a top perspective view similar to FIG. 1 but without the environmental structures;
FIG. 3 is a bottom perspective view thereof;
FIG. 4 is a front elevational view thereof, whereby the opposing rear elevation view is a mirror image;
FIG. 5 is a right side elevational view thereof, whereby the opposing left side elevation view is a mirror image;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a botton plan view thereof.
The broken lines showing the environmental structure in FIG. 1 and portions of the disc golf goal adapter in FIGS. 1-3, 6 and 7 are for illustrative purposes only and form no part of the claimed design.