added border-right for sidemenu

Issue
-
Side menu does not have `border-right`, in tablet mode there is no visible separation between sidemenu and main panel, so added a 1px border similar to splitview in native UI
(Not sure why, #menu `border-right` for all themes were set to `none`, the default css does have a 1px `border-right`, if there was a specific reason for setting `none`, let me know and ignore this pull-request)

Test Case
-
open ios7, android, bb and win8 themes of kitchensink in tablet mode, notice that there is no separator between sidemenu and main panel

Fix
-
Add `border-right` for #menu for ios7, bb, win8, android themes