Replace (redundant) [code](https://github.com/rd2/osut/blob/427aed1663499d19cb5659fd22ba2ae86cdf5ccc/lib/osut/utils.rb#L940) when adjusting insulating layer thermal conductivity and thickness (_genConstruction_): switch to [resetUo](https://github.com/rd2/osut/blob/427aed1663499d19cb5659fd22ba2ae86cdf5ccc/lib/osut/utils.rb#L485).
