Remove unused forward declaration which prevented compilation (#266)

* Remove unused forward declaration which prevented compilation

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Co-authored-by: Paul Sardin <psardin@notorisan>

Author: psardin001

include/hpp/corbaserver/fwd.hh

@@ -45,7 +45,6 @@ class BVHModel;
 class CollisionGeometry;
 class OBBRSS;
 class ShapeBase;
-class Triangle;
 }  // namespace coal
 
 namespace hpp {