(Bloomberg) -- The volatility that buffeted shares of regional banks this week minted big paper profits for short-sellers, reminiscent of their gains during last year’s tumult in the sector.Most Read from BloombergDonald Trump Loses London Case Against Ex-MI6 Spy Over Kremlin DossierA $560 Billion Property Warning Hits Banks From NY to TokyoApple’s China Slump Deepens Even as Total Sales Grow AgainMark Zuckerberg’s Wealth Surges by $27 Billion as Meta RalliesThe Most Popular Man in Ukraine Has B