rm sone unused code

Device/Beam/Beam.cpp

@@ -42,23 +42,6 @@ Beam::Beam(const Beam& other)
         m_shape_factor.reset(other.m_shape_factor->clone());
 }
 
-Beam& Beam::operator=(const Beam& other)
-{
-    if (&other == this)
-        return *this;
-    m_intensity = other.m_intensity;
-    m_wavelength = other.m_wavelength;
-    // m_direction = other.m_direction;
-    m_alpha = other.m_alpha;
-    m_phi = other.m_phi;
-    m_beamPolarization = other.m_beamPolarization;
-    if (other.m_shape_factor)
-        m_shape_factor.reset(other.m_shape_factor->clone());
-    else
-        m_shape_factor.release();
-    return *this;
-}
-
 Beam::~Beam() = default;
 
 Beam* Beam::clone() const