vim-patch:9.0.1670: resetting local option to global value is inconsi…

…stent (neovim#24185)

Problem:    Resetting local option to global value is inconsistent.
Solution:   Handle "<" specifically for 'scrolloff' and 'sidescrolloff'.
            (closes vim/vim#12594)

vim/vim@bf5f189

Co-authored-by: Bram Moolenaar <[email protected]>