Add "pickleball" as value to Sports field (#2196)

Author: tyrasd

data/fields/sport.json

@@ -48,6 +48,7 @@
             "orienteering": "Orienteering",
             "padel": "Padel",
             "pelota": "Pelota",
+            "pickleball": "Pickleball",
             "rugby_union": "Rugby Union",
             "running": "Running",
             "scuba_diving": "Scuba Diving",