Fix PVS-studio error

- QGCMark duplicates field & method from base class

src/Mod/TechDraw/Gui/QGICMark.cpp

@@ -41,7 +41,6 @@ using namespace TechDrawGui;
 
 QGICMark::QGICMark(int index) : QGIVertex(index)
 {
-    projIndex = 0;
     m_size = 3.0;
     m_width = 0.75;
     draw();