WASHINGTON — Maybe it’s all he ever wanted. President Biden is taking heat for spending 40% of his days in office “on vacation” after he was away from the White House for two-thirds of August. Biden’s weekend jaunts and vacations spanned 234 days — with seven in 10 of them spent at his homes in Wilmington and Rehoboth Beach, Delaware — out of 589 days in office. RNC chairwoman Ronna McDaniel told The Post that Republicans believe it’s a winning campaign issue — alongside concerns over the effects of Biden-era spending, including Democrats’ $1.9 trillion stimulus package last year and...