Legrand cover position is inverted

[sebastien-savalle]

ZigBee officially expects "open" to be 0 and "closed" to be 100.
But Legrand reports "open" to be 100 and "closed" to be 0

Open:

debug 2020-02-26 14:13:56: Received MQTT message on 'zigbee2mqtt/volet_salon/set' with data 'OPEN'
debug 2020-02-26 14:13:56: Publishing 'set' 'state' to 'volet_salon'
debug 2020-02-26 14:15:56: Received Zigbee message from 'volet_salon', type 'attributeReport', cluster 'closuresWindowCovering', data '{"currentPositionLiftPercentage":100}' from endpoint 1 with groupID 0
info  2020-02-26 14:15:56: MQTT publish: topic 'zigbee2mqtt/volet_salon', payload '{"position":0,"linkquality":81}'

Closed

debug 2020-02-26 18:37:24: Received MQTT message on 'zigbee2mqtt/volet_salon/set' with data 'CLOSE'
debug 2020-02-26 18:37:24: Publishing 'set' 'state' to 'volet_salon'
debug 2020-02-26 18:39:23: Received Zigbee message from 'volet_salon', type 'attributeReport', cluster 'closuresWindowCovering', data '{"currentPositionLiftPercentage":0}' from endpoint 1 with groupID 0
info  2020-02-26 18:39:23: MQTT publish: topic 'zigbee2mqtt/volet_salon', payload '{"position":100,"linkquality":84}'

[Koenkk]

Merged, thanks!