SEATTLE — The state Supreme Court on Thursday sided with Washington State University in a case that challenged the school’s right to use dwindling stores of groundwater on a new golf course. In a 6-3 decision that came nearly two years after oral arguments, the justices ended a dispute over the Palouse Ridge Golf Club, an 18-hole course that replaced a nine-hole version when it opened in 2008. The new course was controversial because even though it has water-conserving features such as drought-resistant …