Update to Speedtest for Opnsense

[firestormo]

taken from https://github.com/mihakralj/opnsense-speedtest/issues/4

works great on my firewall and love the updates. Just sending a pull req as no one else has done it and to update the code as for me its better to read the dates in local tz not gmt

[mihakralj]

this one is now obsolete and could be closed.