fix(autocomplete focus.point): Use 50km scale parameter

The `scale` parameter controls how quickly scores decrease from the
maximum as the distance from the `center_point` to the record in
question increases.

Set this to 50km, which is the same as search.

Connects https://github.com/pelias/api/issues/1206

query/autocomplete_defaults.js

@@ -28,7 +28,7 @@ module.exports = _.merge({}, peliasQuery.defaults, {
 
   'focus:function': 'exp',
   'focus:offset': '0km',
-  'focus:scale': '250km',
+  'focus:scale': '50km',
   'focus:decay': 0.5,
   'focus:weight': 15,
 

test/unit/fixture/autocomplete_linguistic_focus.js

@@ -39,7 +39,7 @@ module.exports = {
                   'lon': -82.50622
                 },
                 'offset': '0km',
-                'scale': '250km',
+                'scale': '50km',
                 'decay': 0.5
               }
             },

test/unit/fixture/autocomplete_linguistic_focus_null_island.js

@@ -39,7 +39,7 @@ module.exports = {
                   'lon': 0
                 },
                 'offset': '0km',
-                'scale': '250km',
+                'scale': '50km',
                 'decay': 0.5
               }
             },