DepthprobeInstrumentItem: rm unused var

GUI/Model/Device/InstrumentItems.h

@@ -185,13 +185,9 @@ public:
 
     AxisProperty& zAxis() { return m_zAxis; }
 
-    bool isExpandParameters() const { return m_expandParameters; }
-    void setExpandParameters(bool b) { m_expandParameters = b; }
-
 private:
     mutable std::unique_ptr<const ICoordSystem> m_coosys;
     AxisProperty m_zAxis;
-    bool m_expandParameters = true;
 };