Fix Nordpool Spot scheduling

[jpalo]

Fixes issue reported at https://community.openenergymonitor.org/t/emoncms-demand-shaper-module/9097/192?u=jpalo

[TrystanLea]

Thanks @jpalo will look at this soon

[jpalo]

Noticed some issue still with the scheduler yesterday after my fix. It had set the schedule from 9-16 although the configuration in DS is still 4 hours ending at 8. Will try to find the issue...