org-entities: Change \minus to -

* lisp/org-entities.el: The LaTeX command \minus doesn't exist, but a
hyphen in math mode produces a minus symbol.

lisp/org-entities.el

@@ -307,7 +307,7 @@ packages to be loaded, add these packages to `org-latex-packages-alist'."
      ("trade" "\\texttrademark{}" nil "™" "TM" "TM" "™")
 
      "** Science et al."
-     ("minus" "\\minus" t "−" "-" "-" "−")
+     ("minus" "-" t "−" "-" "-" "−")
      ("pm" "\\textpm{}" nil "±" "+-" "±" "±")
      ("plusmn" "\\textpm{}" nil "±" "+-" "±" "±")
      ("times" "\\texttimes{}" nil "×" "*" "×" "×")