Fixed formatting with clang-format

src/TNL/Solvers/Optimization/AdaGrad.h

src/TNL/Solvers/Optimization/AdaGrad.hpp

src/TNL/Solvers/Optimization/GradientDescent.h

src/TNL/Solvers/Optimization/GradientDescent.hpp

src/TNL/Solvers/Optimization/Momentum.h

src/TNL/Solvers/Optimization/Momentum.hpp

src/TNL/Solvers/Optimization/NesterovMomentum.h

src/TNL/Solvers/Optimization/NesterovMomentum.hpp

src/TNL/Solvers/Optimization/RMSProp.h

src/TNL/Solvers/Optimization/RMSProp.hpp