vim: Fix packaging of common data files

The majority of the vim runtime files have been moved from the package
'vim-data' to the package 'vim-common'. However, 'vim-data' was still in
RRECOMMENDS and 'vim-common' was not, so the runtime files were not being
installed by default.

To fix this, 'vim-data' is removed from RRECOMMENDS and 'vim-common' is added
instead. 'vim-data' is also removed from PACKAGES as it should now be empty.

Signed-off-by: Paul Barker <paul@paulbarker.me.uk>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>