package: Don't hide all editors in menuconfig

Don't hide all editors in config if BR2_PACKAGE_BUSYBOX_SHOW_OTHERS is not
selected. Indeed vi is the only editor already provided by busybox.

Signed-off-by: Julien Boibessot <julien.boibessot@armadeus.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>