lisp/ob-eval.el: Append newline to source block query

* lisp/ob-eval.el (org-babel-eval): Newline facilitates working with
Windows cmdproxy.exe.

Reported-by: "Osher Jacob" <osherz5@gmail.com>
Link: https://list.orgmode.org/orgmode/CAGsxwFZ88cybALCVGgma=5gENMhUa0Rk6xNkBNS_HdsmBgYe6w@mail.gmail.com/

lisp/ob-eval.el

@@ -64,7 +64,7 @@ Writes QUERY into a temp-buffer that is processed with
   (let ((error-buffer (get-buffer-create " *Org-Babel Error*")) exit-code)
     (with-current-buffer error-buffer (erase-buffer))
     (with-temp-buffer
-      (insert query)
+      (insert query "\n")
       (setq exit-code
             (org-babel--shell-command-on-region
              command error-buffer))