Incorrect description for "cost per length or weight" checkbox

[ntoff]

Looks like it has the description from octoprint's auto connect setting.
https://github.com/jasiek/OctoPrint-Cost/blob/master/octoprint_cost/templates/cost_settings.jinja2#L26

[duckfullstop]

This was bugging me too, so I've just raised a PR to change the wording of this checkbox (#21)

I've completely misread this issue, sorry! I do note that it was closed by by PR #12 though.