Remove dead member (Coverity)

rtgui/filmsimulation.h

@@ -45,7 +45,6 @@ private:
 
     static std::unique_ptr<ClutModel> cm; // we use a shared TreeModel for all the combo boxes, to save time (no need to reparse the clut dir multiple times)...
     static std::unique_ptr<ClutModel> cm2; // ... except when options.multiDisplayMode (i.e. editors in their own window), where we need two. This is because we might have two combo boxes displayed at the same time in this case
-    int count; // the number of clut entries
     bool batchMode;
 };