in lua api, don't set a default if cite-method is false

Author: cderv

src/resources/pandoc/datadir/init.lua

@@ -2082,7 +2082,7 @@ quarto = {
     is_format = format.isFormat,
 
     cite_method = function() 
-      local citeMethod = param('cite-method', 'citeproc')
+      local citeMethod = param('cite-method', nil)
       return citeMethod
     end,
     pdf_engine = function() 

tests/docs/smoke-all/2025/03/27/12299.lua

@@ -1,5 +1,5 @@
 function Pandoc(doc)
   assert(quarto.doc.pdf_engine() == "xelatex", "`quarto.doc.pdf_engine()` should be xelatex but is instead: " .. quarto.doc.pdf_engine())
-  assert(quarto.doc.cite_method() == "natbib", "`quarto.doc.cite_method()` should return natbib but return instead: " .. quarto.doc.cite_method())
+  assert(quarto.doc.cite_method() == nil, "`quarto.doc.cite_method()` should return natbib but return instead: " .. (quarto.doc.cite_method() or 'unset'))
   return doc
 end