FRANKFURT (Reuters) -Deutsche Bank posted a better-than-expected 51% rise in second-quarter profit as investment banking revenues rose, figures on Wednesday showed. Net profit attributable to shareholders was 1.046 billion euros ($1.06 billion). That compares with profit of 692 million euros a year earlier, and it is better than analyst expectations for profit of around 788 million euros. It was the eighth consecutive quarter of profit, a notable streak after years of losses. This year is crucial for Germany’s largest lender and Chief Executive Christian Sewing as he tries to deliver on target…