BRUSSELS — The Trump administration has reassured the EU’s top trade lawmaker that it plans to shorten a list of items containing steel that are subject to high U.S. tariffs, in a concession that could finally persuade the European Parliament to back last year’s transatlantic trade deal.  The offer came in a call between U.S. Trade Representative Jamieson Greer with Bernd Lange, the chair of the European Parliament’s Trade Committee. It has helped win the support of Lange’s fellow socialists,