BLI: Fix drawdata leak on Scene IDs

A call to `DRW_drawdata_free` must be present for all ids that can hold
draw data. The Scene ID was missing one and was leaking data on
EEVEE-Next.

source/blender/blenkernel/intern/scene.cc

@@ -113,6 +113,8 @@
 #include "IMB_colormanagement.h"
 #include "IMB_imbuf.h"
 
+#include "DRW_engine.h"
+
 #include "bmesh.h"
 
 CurveMapping *BKE_sculpt_default_cavity_curve()
@@ -380,10 +382,11 @@ static void scene_free_markers(Scene *scene, bool do_id_user)
 
 static void scene_free_data(ID *id)
 {
-
   Scene *scene = (Scene *)id;
   const bool do_id_user = false;
 
+  DRW_drawdata_free(id);
+
   SEQ_editing_free(scene, do_id_user);
 
   BKE_keyingsets_free(&scene->keyingsets);