The case block in git.aliases.bash does the right thing for vim users
that do not populate $EDITOR. However vim users that populate $EDITOR
are met with the following error:
$ gd
Vim: Warning: Input is not from a terminal
Vim: Error reading input, exiting...
Vim: preserving files...
Vim: Finished.
Fix this inconsistency by adding another case block in the else block
which handles passing the appropriate arguments to vim.
Signed-off-by: Michael Turquette <mturquette@deferred.io>