fix guishapeedpreview not displaying IBL

note this *does* require a baked skylight in the main scene
todo: track down why a similar protocol does not operate for guimaterialpreview and guiobjectview

Engine/source/T3D/lighting/reflectionProbe.h

@@ -378,6 +378,7 @@ public:
    /// Invokes a cubemap bake action for this probe
    /// </summary>
    void bake();
+   ProbeInfo* getProbeInfo() { return &mProbeInfo; }
 };
 
 typedef ReflectionProbe::ProbeInfo::ProbeShapeType ReflectProbeType;