Fixed bug that was hosing the background color in plots saved from the Tk/DP driver menu.
Fixed bug that was hosing the background color in plots saved from the
Tk/DP driver menu.

svn path=/trunk/; revision=1057

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot