Ovlaim ceiling fan: timer off is off, hour is spelt in full

Based on log, the device is sending "off" rather than "cancel" for timer off
From the QueryThingsDataModel result, we can see it also spells out
hour in full for the other options.

Discussion #1728

custom_components/tuya_local/devices/ovlaim_ceiling_fan_light.yaml

@@ -58,13 +58,13 @@ secondary_entities:
         type: string
         name: option
         mapping:
-          - dps_val: cancel
+          - dps_val: "off"
             value: "Off"
-          - dps_val: "1h"
+          - dps_val: "1hour"
             value: "1 hour"
-          - dps_val: "2h"
+          - dps_val: "2hour"
             value: "2 hours"
-          - dps_val: "4h"
+          - dps_val: "4hour"
             value: "4 hours"
-          - dps_val: "8h"
+          - dps_val: "8hour"
             value: "8 hours"