Remove unused deprecation strings (home-assistant#156097)

Author: alengwenus

homeassistant/components/lcn/strings.json

@@ -93,16 +93,6 @@
       "message": "Invalid state for sending keys. Only 'hit' allowed for deferred sending."
     }
   },
-  "issues": {
-    "deprecated_keylock_sensor": {
-      "description": "Your LCN key lock binary sensor entity `{entity}` is being used in automations or scripts. A key lock switch entity is available and should be used going forward.\n\nPlease adjust your automations or scripts to fix this issue.",
-      "title": "Deprecated LCN key lock binary sensor"
-    },
-    "deprecated_regulatorlock_sensor": {
-      "description": "Your LCN regulator lock binary sensor entity `{entity}` is being used in automations or scripts. A regulator lock switch entity is available and should be used going forward.\n\nPlease adjust your automations or scripts to fix this issue.",
-      "title": "Deprecated LCN regulator lock binary sensor"
-    }
-  },
   "services": {
     "address_to_device_id": {
       "description": "Converts an LCN address into a device ID.",