(Corrects first paragraph to show the holding dropped to 0.92% from 3.18%) FRANKFURT (Reuters) – The holding by a top investor in Deutsche Bank, Douglas Braunstein of Hudson Executive Capital, dropped to 0.92% from 3.18%, according to a filing on Friday. Braunstein, a former finance chief of JP Morgan Chase, invested in Deutsche in 2018, backing Chief Executive Christian Sewing’s efforts to turn around Germany’s biggest bank and making him one its largest shareholders. Braunstein declined to comment on the reason for the reduction. Deutsche Bank, whose shares have risen 35% since Braunstein’s …