Add axiom to emission quantity value - oeox paper quick fix

[nelekoehler]

Description of the issue

While working on the oeox paper, we noticed that emission quantity value does not yet have an axiom for emission or CO2 emission or vice versa.
It is planned to revise the quantities and quantity values anyway (see #1510), but in the context of the paper, a start should be made at this point.

Ideas of solution

emission quantity value:

SubClass Of
'quantity value of' some 'emission'

[l-emele]

This issue is parallel to #1759 which is already more elaborated. So I close this issue here.