Updated MM config for KW Rocketry v2.6d2.

Updated MM config for KW Rocketry v2.6d2:
* added missing tanks (5m, unpainted and L0.5 tanks)
* changed volumes to match KW rebalancing

also
* changed "Cryogenic" tanks to "Default"

Note: Some volumes now have decimal fractions in volume, which may not be desirable.