Refer cart corral icon to its v5 name (#457)

Also removed 'cart corral' from terms since I changed the preset name to this

data/presets/amenity/trolley_bay.json

@@ -1,5 +1,5 @@
 {
-    "icon": "fas-cart-shopping",
+    "icon": "fas-shopping-cart",
     "fields": [
         "capacity",
         "deposit/trolley",
@@ -22,7 +22,6 @@
     },
     "terms": [
         "carriage return",
-        "cart corral",
         "cart return",
         "shopping cart",
         "trolley bay"