fix reversed label problem

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/ggbio@76404 bc3139a8-67e5-0310-9ffc-ced21a209358
works for linear combination with layout_circle

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/ggbio@76405 bc3139a8-67e5-0310-9ffc-ced21a209358