CI: Suppress unnecessary warnings from commands on MacOS

Resolves issue #578 (closed)

GUI/Model/Device/InstrumentItems.h

@@ -88,7 +88,6 @@ public:
     BackgroundItem* backgroundItem() const { return m_background.currentItem(); }
 
     bool withPolarizerAnalyzer() const { return m_withPolarizerAnalyzer; }
-    void setWithPolarizerAnalyzer(bool with) { m_withPolarizerAnalyzer = with; }
     bool withPolarizer() const { return m_withPolarizer; }
     void setWithPolarizer(bool with) { m_withPolarizer = with; }
     bool withAnalyzer() const { return m_withAnalyzer; }