Cleanup: Remove unused image Image pointer from LigthPrope data.

This pointer was fully unused, no point in keeping it around.

source/blender/blenkernel/intern/lightprobe.cc

@@ -40,7 +40,6 @@ static void lightprobe_foreach_id(ID *id, LibraryForeachIDData *data)
 {
   LightProbe *probe = (LightProbe *)id;
 
-  BKE_LIB_FOREACHID_PROCESS_IDSUPER(data, probe->image, IDWALK_CB_USER);
   BKE_LIB_FOREACHID_PROCESS_IDSUPER(data, probe->visibility_grp, IDWALK_CB_NOP);
 }
 

source/blender/makesdna/DNA_lightprobe_types.h

@@ -81,10 +81,6 @@ typedef struct LightProbe {
    */
   int resolution;
 
-  void *_pad2;
-
-  /** Image to use on as lighting data. */
-  struct Image *image;
   /** Object visibility group, inclusive or exclusive. */
   struct Collection *visibility_grp;
 } LightProbe;