ob-shell: Add missing "sh" to "shell" conversions
* lisp/ob-shell.el (org-babel-default-header-args:shell): Renamed from
`org-babel-default-header-args:sh'.
(org-babel-variable-assignments:shell): Renamed from
`org-babel-variable-assignments:sh'.
(org-babel-prep-session:shell): Renamed from
`org-babel-prep-session:sh'. Apply renaming.
(org-babel-load-session:shell): Renamed from
`org-babel-load-session:sh'. Apply renaming.
(org-babel-execute:shell): Apply renaming.
Reported-by: Sebastien Vauban
<http://permalink.gmane.org/gmane.emacs.orgmode/98859>