Fix battary_life property

Viomi's property battery life seems to have a weird typo. The property's real name is `battary_life` instead of `battery_life`. Using the wrong name `battery_life` makes the other properties in the batch to be undefined: `"run_state","mode","err_state","battary_life","box_type"`

The correct name `battary_life` is already used in other projects like https://github.com/rytilahti/python-miio/blob/master/miio/viomivacuum.py#L316 or https://github.com/Hypfer/Valetudo/blob/0bed81ab4f0ddccdad044ce805dda3af8736eb96/lib/robots/viomi/ViomiValetudoRobot.js#L254

bundles/org.openhab.binding.miio/src/main/resources/database/viomi.vacuum.v8.json

@@ -60,7 +60,7 @@
 				"actions": []
 			},
 			{
-				"property": "battery_life",
+				"property": "battary_life",
 				"friendlyName": "Battery",
 				"channel": "battery_life",
 				"type": "Number",