images: Tango is the most complete theme.

Change-Id: I211d21b09223dfacac18e879993b0f0943b94741
diff --git a/xmlhelp/source/cxxhelp/provider/databases.cxx b/xmlhelp/source/cxxhelp/provider/databases.cxx
index b7c2014..a6c8d3e 100644
--- a/xmlhelp/source/cxxhelp/provider/databases.cxx
+++ b/xmlhelp/source/cxxhelp/provider/databases.cxx
@@ -276,14 +276,13 @@ OString Databases::getImagesZipFileURL()
            {
                if ( aSymbolsStyleName.equalsAscii("auto") )
                {
                    OUString const & env = Application::GetDesktopEnvironment();
                    if ( env.equalsIgnoreAsciiCase("tde") ||
                         env.equalsIgnoreAsciiCase("kde") )
                        aSymbolsStyleName = "crystal";
                    else if ( env.equalsIgnoreAsciiCase("kde4") )
                        aSymbolsStyleName = "oxygen";
                    else
                        aSymbolsStyleName = "tango";
                    // with the layered images*.zip, tango is the most
                    // complete theme, so show that one
                    // FIXME instead of using a general vnd.sun.star.zip://
                    // for imgrepos, we should have some vnd.sun.star.image://
                    // so that we don't have to re-open the stream for every
                    // image in the help
                    aSymbolsStyleName = "tango";
                }
                OUString aZipName = "images_" + aSymbolsStyleName + ".zip";