inline fct call -> break one dependency on ItemToAxis

GUI/Model/Device/InstrumentItems.cpp

@@ -420,8 +420,10 @@ const ICoordSystem* SpecularInstrumentItem::createCoordSystem() const
                                               native_units);
     }
 
-    return new AngularReflectometryCoords(scanItem()->wavelength(), *axis_item->itemToAxis(1.0),
-                                          Coords::DEGREES);
+    FixedBinAxis axis(axis_item->title().toStdString(), axis_item->binCount(), axis_item->min(),
+                      axis_item->max());
+
+    return new AngularReflectometryCoords(scanItem()->wavelength(), axis, Coords::DEGREES);
 }
 
 ISimulation* SpecularInstrumentItem::createSimulation(const MultiLayer& sample) const