[patch 1.4] small correction to the natbib fix

[Jürgen Spitzmüller]

I found a small glitch in the backport that resulted in LyX not exporting the 
correct natbib cite commands, but always \cite instead. Trunk is correct in 
this regard.

Patch against 1.4svn attached. OK? 

Jürgen

Index: src/insets/insetcite.C
===================================================================
--- src/insets/insetcite.C	(Revision 17544)
+++ src/insets/insetcite.C	(Arbeitskopie)
@@ -402,7 +402,7 @@
 int InsetCitation::latex(Buffer const & buffer, ostream & os,
 			 OutputParams const &) const
 {
-	biblio::CiteEngine const cite_engine = buffer.params().cite_engine;
+	biblio::CiteEngine const cite_engine = buffer.params().getEngine();
 	string const cite_str =
 		biblio::asValidLatexCommand(getCmdName(), cite_engine);