drop undocumented/deprecated fields of the tourism=trail_riding_station preset

data/fields/horse_dressage.json

@@ -1,15 +0,0 @@
-{
-    "key": "sport",
-    "type": "check",
-    "label": "Dressage Riding",
-    "strings": {
-        "options": {
-            "undefined": "No",
-            "equestrian": "Yes"
-        }
-    },
-    "reference": {
-        "key": "sport",
-        "value": "equestrian"
-    }
-}

data/fields/horse_riding.json

@@ -1,7 +1,7 @@
 {
     "key": "leisure",
     "type": "check",
-    "label": "Horseback Riding",
+    "label": "Horseback Riding Center",
     "strings": {
         "options": {
             "undefined": "No",

data/fields/horse_stables.json

@@ -1,15 +0,0 @@
-{
-    "key": "amenity",
-    "type": "check",
-    "label": "Riding Stable",
-    "strings": {
-        "options": {
-            "undefined": "No",
-            "stables": "Yes"
-        }
-    },
-    "reference": {
-        "key": "amenity",
-        "value": "stables"
-    }
-}

data/presets/tourism/trail_riding_station.json

@@ -2,9 +2,7 @@
     "icon": "maki-horse-riding",
     "fields": [
         "name",
-        "horse_stables",
-        "horse_riding",
-        "horse_dressage"
+        "horse_riding"
     ],
     "moreFields": [
         "{@templates/contact}",