GLENS FALL, N.Y. — The celebration was muted for the Burnt Hills-Ballston Lake varsity field hockey team at the final whistle of its 6-1 victory in the Section 2 Class B championship game at Glen Falls High School on Sunday. But don’t let that fool you into thinking the Spartans weren’t elated after securing their fourth consecutive area title. “I feel like as a team, this is something that obviously we work towards, and we’ve been here a lot, s…