Fix logback.xml again
Fix logback.xml again

YYYY is not valid format, yyyy is.

RuuviTracker/ruuvitracker_server,RuuviTracker/ruuvitracker_server,jsyrjala/ruuvitracker_server,sushilhalai/GPS,ruuvi/ruuvitracker_server,RuuviTracker/ruuvitracker_server,ruuvi/ruuvitracker_server,ruuvi/ruuvitracker_server,jsyrjala/ruuvitracker_server,sushilhalai/GPS