Fix for missing meshState update. (#777)

Summary:
Pull Request resolved: #777

We weren't updating the meshState in the sequence_solver_function getError() function.  This turned out to be a bit hard to catch because it only shows up as an issue if you are running the sequence solver with line search turned on.

Reviewed By: cstollmeta

Differential Revision: D86116253

fbshipit-source-id: a7b6cda036abc00dcd9eb0d772e5c11494e71dac

Author: cdtwigg

momentum/character_sequence_solver/sequence_solver_function.cpp

@@ -192,6 +192,9 @@ double SequenceSolverFunctionT<T>::getError(const Eigen::VectorX<T>& parameters)
   // update the state according to the transformed parameters
   dispenso::parallel_for(0, nFrames, [&](size_t f) {
     states_[f].set(parameterTransform_.apply(frameParameters_[f]), character_.skeleton);
+    if (needsMesh_) {
+      meshStates_[f].update(frameParameters_[f], states_[f], character_);
+    }
   });
 
   // sum up error for all per-frame error functions