Move overrides to a map rando branch of the sm-json-data (#288)

Author: kjbranch

.gitmodules

@@ -1,6 +1,7 @@
 [submodule "sm-json-data"]
 	path = sm-json-data
-	url = https://github.com/vg-json-data/sm-json-data.git
+	url = https://github.com/kjbranch/sm-json-data.git
+	branch = map-rando
 [submodule "MapRandoSprites"]
 	path = MapRandoSprites
 	url = https://github.com/blkerby/MapRandoSprites