By Giuseppe Fonte ROME (Reuters) -Many Italian energy companies appear not to have paid an initial windfall tax payment due by the end of June, leaving the government facing a revenue shortfall of more than 9 billion euros ($9.2 billion), a Treasury document showed. Prime Minister Mario Draghi has budgeted 33 billion euros since January to help firms and households facing sky-high electricity, gas and petrol costs, as the Ukraine crisis weighed on growth prospects for the euro zone’s third largest economy. Between 10 and 11 billion euros of the total package was expected to be funded through a…