Arlec 12-speed fan: fix typo in preset_mode config.

Issue #542

custom_components/tuya_local/devices/arlec_12speed_tower_fan.yaml

@@ -10,7 +10,7 @@ primary_entity:
     - id: 2
       name: preset_mode
       type: string
-      mappoing:
+      mapping:
         - dps_val: normal
           value: Normal
         - dps_val: natural