Enabled coal consumption in blast furnace burner

* Enabled coal consumption in blast furnace burner to avoid overconsumption of natural gas for countries such as the UK (these countries have high coal (i.e. coke oven coke) consumption and low network gas in the iron and steel sector. See also issue https://github.com/quintel/etdataset/issues/490 and ETdataset pull request https://github.com/quintel/etdataset/pull/492.

* Reimported datasets for all countries.