VIM: disable Command-Shift-T shortcut
VIM: disable Command-Shift-T shortcut

This doesn't work in the current MacVim snapshot, and I never used it
anyway, so just get rid of it.

A new tab can be opened in any case with ":tabe".

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent