Bug: changing scale & offset value gives random behaviors

[KipK]

Remembered someone who got some random GFCI + No Ground errors displayed with same value as scale & offset value. ( 5, 6 )
Got the same and can reproduce using this pattern:

1/ set a new scale & offset value over /config endpoint, i.e:
{
"scale": 222
"offset": 5
}

2/ restart evse module ( GFCI and No Gnd errors spawn )
Nows /config endpoint gives "scale": 5, "offset": 6 ( needs to refresh UI to display new values as config_version has not been updated )

and /status gfcicount: 5 , nogndcount: 6

3/ restart gateway: nows scale & offset are ok ( "scale": 222, "offset": 5 ) , and no errors.

4/ now restart evse again: refresh UI or get /config endpoint. We now have "scale": 32 , "offset": 8021
and no gfci/gnd errors this time.

5/ restart gateway, values are ok again.
6/ and again /restart: now "scale" & "offset" are booth 0
etc...

some related issues:
#480 , this one on forum

[KipK]

the $GA gives corrects ammetter settings when it's wrong on gw so the issue comes from gateway fw.