Add locksmith shop (#1188)

Fixes #566

This PR adds support for `shop=locksmith`.

Example OSM object: https://www.openstreetmap.org/way/874850561

Rendered tile:
![image](https://user-images.githubusercontent.com/3254090/130335938-e76cf3d2-dfe7-4398-a647-463fc216d674.png)

layers/poi/mapping.yaml

@@ -181,6 +181,7 @@ def_poi_mapping_shop: &poi_mapping_shop
   - kiosk
   - lamps
   - laundry
+  - locksmith
   - mall
   - massage
   - mobile_phone

layers/poi/poi.yaml

@@ -21,10 +21,10 @@ layer:
                      'coffee', 'computer', 'convenience', 'copyshop', 'cosmetics', 'garden_centre', 'doityourself',
                      'erotic', 'electronics', 'fabric', 'florist', 'frozen_food', 'furniture', 'video_games', 'video',
                      'general', 'gift', 'hardware', 'hearing_aids', 'hifi', 'ice_cream', 'interior_decoration',
-                     'jewelry', 'kiosk', 'lamps', 'mall', 'massage', 'motorcycle', 'mobile_phone', 'newsagent',
-                     'optician', 'outdoor', 'perfumery', 'perfume', 'pet', 'photo', 'second_hand', 'shoes', 'sports',
-                     'stationery', 'tailor', 'tattoo', 'ticket', 'tobacco', 'toys', 'travel_agency', 'watches',
-                     'weapons', 'wholesale']
+                     'jewelry', 'kiosk', 'locksmith', 'lamps', 'mall', 'massage', 'motorcycle', 'mobile_phone', 
+                     'newsagent', 'optician', 'outdoor', 'perfumery', 'perfume', 'pet', 'photo', 'second_hand', 
+                     'shoes', 'sports', 'stationery', 'tailor', 'tattoo', 'ticket', 'tobacco', 'toys', 'travel_agency', 
+                     'watches', 'weapons', 'wholesale']
         town_hall:
           subclass: ['townhall', 'public_building', 'courthouse', 'community_centre']
         golf: