By Paul Carrel (Reuters) -The worst post-war result for Chancellor Olaf Scholz’s Social Democrats in a traditional party stronghold heaps pressure on him to show more decisive leadership over the Ukraine crisis and Germans’ concerns about soaring costs of living. Scholz’s SPD lost a regional election in North Rhine-Westphalia (NRW), Germany’s most populous state, to the conservative Christian Democrats (CDU) on Sunday – a setback for the chancellor after just five months in office. The result reflected voter frustration with Scholz’s cautious leadership, but the contrasting fortunes of his coa…