Detector2D simpler arg name

Device/Detector/Detector2D.cpp

@@ -26,11 +26,10 @@ using std::numbers::pi;
 
 Detector2D::Detector2D(double phi_span, double alpha_span, size_t n_phi, size_t n_alpha,
                        double phi_center, double alpha_center)
-    : IDetector(
-        new Frame(newEquiDivision("phi_f (rad)", n_phi, phi_center - phi_span / 2,
-                                  phi_center + phi_span / 2),
-                  newEquiDivision("alpha_f (rad)", n_alpha, alpha_center - alpha_span / 2,
-                                  alpha_center + alpha_span / 2)))
+    : IDetector(new Frame(
+        newEquiDivision("phi_f (rad)", n_phi, phi_center - phi_span / 2, phi_center + phi_span / 2),
+        newEquiDivision("alpha_f (rad)", n_alpha, alpha_center - alpha_span / 2,
+                        alpha_center + alpha_span / 2)))
 {
     ASSERT(-pi / 2 < axis(0).min() && axis(0).max() < +pi / 2);
     ASSERT(-pi / 2 < axis(1).min() && axis(1).max() < +pi / 2);