Rename 'Motorway Junction / Exit' to 'Motorway Exit' (#1810)

Author: matkoniecz

data/presets/highway/motorway_junction.json

@@ -13,5 +13,5 @@
     "terms": [
         "exit"
     ],
-    "name": "Motorway Junction / Exit"
+    "name": "Motorway Exit"
 }