Fix absorption computation in glass BSDF
Fix absorption computation in glass BSDF

Vertexwahn/appleseed,appleseedhq/appleseed,docwhite/appleseed,dictoon/appleseed,pjessesco/appleseed,appleseedhq/appleseed,docwhite/appleseed,aytekaman/appleseed,aytekaman/appleseed,dictoon/appleseed,Aakash1312/appleseed,glebmish/appleseed,Biart95/appleseed,appleseedhq/appleseed,est77/appleseed,aiivashchenko/appleseed,luisbarrancos/appleseed,luisbarrancos/appleseed,appleseedhq/appleseed,dictoon/appleseed,pjessesco/appleseed,Aakash1312/appleseed,dictoon/appleseed,aiivashchenko/appleseed,est77/appleseed,gospodnetic/appleseed,docwhite/appleseed,Vertexwahn/appleseed,dictoon/appleseed,glebmish/appleseed,luisbarrancos/appleseed,glebmish/appleseed,pjessesco/appleseed,pjessesco/appleseed,gospodnetic/appleseed,Vertexwahn/appleseed,Vertexwahn/appleseed,est77/appleseed,appleseedhq/appleseed,aiivashchenko/appleseed,aytekaman/appleseed,luisbarrancos/appleseed,Biart95/appleseed,Biart95/appleseed,pjessesco/appleseed,gospodnetic/appleseed,docwhite/appleseed,est77/appleseed,Vertexwahn/appleseed,aiivashchenko/appleseed,est77/appleseed,gospodnetic/appleseed,docwhite/appleseed,Aakash1312/appleseed,Aakash1312/appleseed,gospodnetic/appleseed,luisbarrancos/appleseed,glebmish/appleseed,Biart95/appleseed,aytekaman/appleseed,glebmish/appleseed,Biart95/appleseed,aytekaman/appleseed,aiivashchenko/appleseed,Aakash1312/appleseed