prefer cloning in initializer

Device/Detector/IDetector.cpp

@@ -77,10 +77,9 @@ IDetector::IDetector(const IDetector& other)
     , m_explicitROI(other.m_explicitROI)
     , m_axes(other.m_axes)
     , m_polAnalyzer(other.m_polAnalyzer)
+    , m_resolution(other.m_resolution ? other.m_resolution->clone() : nullptr)
     , m_mask(other.m_mask)
 {
-    if (other.m_resolution)
-        setDetectorResolution(*other.m_resolution);
 }
 
 IDetector::~IDetector() = default;