Consistently use "one true brace" in ExponentialSpringForce.cpp
Consistently use "one true brace" in ExponentialSpringForce.cpp

Prior to this commit, I didn't put the closing brace on a new line for short 1 to 3 line methods.

Now, the closing brace appears at the beginning of a new line for all methods, except the few methods that are only one liners.

simbody/simbody,simbody/simbody