Fix building of standalone bjam docs after Daniel's changes broke them.

[SVN r60772]

historic/jam/doc/build.jam

@@ -30,8 +30,9 @@ boostbook standalone
         <dependency>html
         <dependency>html/images
         <xsl:param>boost.root=.
-        -<xsl:param>nav.layout=horizontal
+        -<xsl:param>boost.defaults=Boost
         <xsl:param>nav.layout=none
+        <xsl:param>boost.image=Boost
         <format>html:<xsl:param>admon.graphics.path=images/
         <format>html:<xsl:param>navig.graphics.path=images/
     ;