Fix: GPv3: Crash when storing deformed points

The issue was that the optional array was not correctly initialized.

Ref !113858

source/blender/blenkernel/intern/geometry_component_edit_data.cc

@@ -98,7 +98,7 @@ static void remember_deformed_grease_pencil_if_necessary(const GreasePencil *gre
     if (drawing->strokes().points_num() != orig_drawing->strokes().points_num()) {
       continue;
     }
-    drawing_hints.positions->as_mutable_span().copy_from(drawing->strokes().positions());
+    drawing_hints.positions.emplace(drawing->strokes().positions());
   }
 }