EAST GREENBUSH, N.Y. — Columbia boys’ varsity baseball senior Ascher Melino had never been doused with anything resembling a Gatorade shower following a big win. That changed on Wednesday. With the bases loaded, one out and the score tied 1-1 in the bottom of the ninth of a Section 2 Class AA first-round thriller against Burnt Hills-Ballston Lake, it was Melino’s bat that delivered an electric postseason victory for the Blue Devils. All the pres…