Org: exclude universal tex preamble from snippets

config.org

@@ -5223,9 +5223,10 @@ a bit cleverer, and handle the "universal preamble" while we're at it.
                          (goto-char (point-min))
                          (search-forward-regexp "#\\+BEGIN_SRC\\|#\\+begin_src" nil t))
                    t)))
-      (concat header
-              org-latex-universal-preamble
-              (when src-p org-latex-minted-preamble))))
+      (if snippets-p header
+        (concat header
+                org-latex-universal-preamble
+                (when src-p org-latex-minted-preamble)))))
 
   (defvar org-latex-minted-preamble "
 <<org-minted-preamble>>