vim: fix depends configuration

vim: fix depends configuration

Due to the incorrect DEPENDS configuration, the vim-full and vim-fuller
packages won't show up in menuconfig if the vim-runtime package is not
selected. This happens because these packages depend on vim-runtime.

To fix this, add the '+' symbol to the DEPENDS line. This ensures that
when either vim-full or vim-fuller is selected, the vim-runtime package
(which is a dependency) will also be selected automatically.

Fixes: d1351b3 ("vim: fix config and runtime")
Signed-off-by: TeleostNaCl Dai <redacted>