use correct function to add button to the menu. also, we should set limit_headers to TRUE if account type supports it. fix a couple of bugs intoduced while forward-porting.
use correct function to add button to the menu. also, we should set
limit_headers to TRUE if account type supports it. fix a couple of bugs
intoduced while forward-porting.

Signed-off-by: Ivaylo Dimitrov <33108af3754aa6cee539fe10fd0c4af0c424801a@gmail.com>

community-ssu/modest,community-ssu/modest,community-ssu/modest,community-ssu/modest