vim-patch:9.2.0254: w_locked can be bypassed when setting recursively

Problem:  w_locked can be bypassed when recursively set if not restored
          to its prior value.
Solution: Rather than save/restore everywhere, just make it a count,
          like other locks (Sean Dewar)

Requires the previous commit, otherwise b_nwindows will be wrong in
tests, which causes a bunch of weird failures.

closes: vim/vim#19728

https://github.com/vim/vim/commit/7cb43f286e55853cf21b9d8870a430390c1cc8f1

Co-authored-by: Sean Dewar <6256228+seandewar@users.noreply.github.com>

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