Fix: Missing virtual destructor on virtual class

This caused an ASAN report for new/delete type mismatch
when using the snake hook brush in curves sculpt mode.

source/blender/editors/sculpt_paint/curves_sculpt_grow_shrink.cc

@@ -57,6 +57,7 @@ using bke::CurvesGeometry;
  */
 class CurvesEffect {
  public:
+  virtual ~CurvesEffect() = default;
   virtual void execute(CurvesGeometry &curves,
                        Span<int> curve_indices,
                        Span<float> move_distances_cu) = 0;