Wrong total data transferred is reported in testnet dashboard

[tadaskay]

https://testnet.mysterium.network/node/0x1ad25703e87839cd9b94617e4357c8eed51d5100/openvpn

It shows not total, but total of the last 10 sessions.
Actual total should be several GBs.

[interro]

closed by PR mysteriumnetwork/api#143

[zolia]

Fixed.