LaTeX export: Swap \begin{document} and the title/author definitions

* lisp/org-latex.el (org-export-latex-make-header): Swap \begin{document}
and the title/author definitions.

Patch by Sebastian Hofer.

TINYCHANGE

lisp/org-latex.el

@@ -1281,6 +1281,8 @@ OPT-PLIST is the options plist for current buffer."
      (org-export-apply-macros-in-string org-export-latex-append-header)
      ;; define alert if not yet defined
      "\n\\providecommand{\\alert}[1]{\\textbf{#1}}"
+     ;; beginning of the document
+     "\n\\begin{document}\n\n"
      ;; insert the title
      (format
       "\n\n\\title{%s}\n"
@@ -1297,8 +1299,6 @@ OPT-PLIST is the options plist for current buffer."
 	     (format-time-string
 	      (or (plist-get opt-plist :date)
 		  org-export-latex-date-format)))
-     ;; beginning of the document
-     "\n\\begin{document}\n\n"
      ;; insert the title command
      (when (string-match "\\S-" title)
        (if (string-match "%s" org-export-latex-title-command)