revert back to consistent copyright statement

Core/include/ACTS/Surfaces/BoundaryCheck.hpp

Core/include/ACTS/Surfaces/DiscTrapezoidalBounds.hpp

Core/include/ACTS/Surfaces/EllipseBounds.hpp

Core/include/ACTS/Surfaces/InfiniteBounds.hpp

Core/include/ACTS/Surfaces/LineBounds.hpp

Core/include/ACTS/Surfaces/PlanarBounds.hpp

Core/include/ACTS/Surfaces/RadialBounds.hpp

Core/include/ACTS/Surfaces/RectangleBounds.hpp

Core/include/ACTS/Surfaces/SurfaceBounds.hpp

Core/include/ACTS/Surfaces/TrapezoidBounds.hpp

Core/include/ACTS/Surfaces/TriangleBounds.hpp

Core/include/ACTS/Utilities/detail/RealQuadraticEquation.hpp

Core/src/Surfaces/LineBounds.cpp

Core/src/Surfaces/RadialBounds.cpp

Core/src/Surfaces/RectangleBounds.cpp

Core/src/Surfaces/TrapezoidBounds.cpp

Core/src/Surfaces/TriangleBounds.cpp