[pathmunge] remove duplicate entry into PATH variable on reload command

plugins/available/latex.plugin.bash

@@ -4,6 +4,6 @@ about-plugin 'use mactex'
 # add mactex to the path if its present
 MACTEX_PATH=/usr/local/texlive/2009/bin/universal-darwin
 if [[ -d  $MACTEX_PATH ]]; then
-    export PATH=$PATH:$MACTEX_PATH
+  pathmunge $MACTEX_PATH after
 fi
 unset MACTEX_PATH