fix in predict.bayesr

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1089 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
fixed predict.bayesr() when using interaction parametric effects

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1090 edb9625f-4e0d-4859-8d74-9fd3b1da38cb