make use of lambda's [=]

Sample/HardParticle/HemiEllipsoid.cpp

@@ -53,10 +53,6 @@ complex_t HemiEllipsoid::formfactor_at_bottom(C3 q) const
     return M_TWOPI * H
            * ComplexIntegrator().integrate(
                [=](double z) {
-                   double R = m_radius_x;
-                   double W = m_radius_y;
-                   double H = m_height;
-
                    double Rz = R * std::sqrt(1.0 - z * z);
                    double Wz = W * std::sqrt(1.0 - z * z);