fix photon is stuck problem in octree/bintree
fix photon is stuck problem in octree/bintree

SKIRT/SKIRT,raesjo/SKIRTcorona,SKIRT/SKIRT,raesjo/SKIRT,SKIRT/SKIRT,raesjo/SKIRT,raesjo/SKIRT,raesjo/SKIRTcorona,raesjo/SKIRTcorona