In the generated neomutt configuration, source the optional
`vim-keys.rc` before applying the `binds` configuration, to allow the
user to override keybindings from `vim-keys.rc`.
Adapt the test files to account for the empty space left by the unset
`vimKeys` option.
neomutt: Updated options and added tests
neomutt: Added test for individual mailbox type
neomutt: Formatted code
neomutt: Enable ssl_force_tls based on IMAP instead of SMTP
neomutt: Applied suggestions from @chayleaf
neomutt: fix breaking tests
