By Andrew MacAskill and Alistair Smout LIVERPOOL, England (Reuters) -Keir Starmer, leader of Britain’s Labour Party, on Sunday pledged to reverse the abolition of the top rate of income tax, saying tax cuts for the wealthy wouldn’t create growth as he made a pitch for power at the annual party conference. Starmer, who leads Britain’s main opposition party, said he would reintroduce the top rate of income tax to 45% after the government abolished the rate in a mini-budget. Starmer is under pressure to assert himself as the prime minister-in-waiting as he starts his campaign for power at this we…