gh-155875: Fix new_prescr screen lifetime - #155914
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Summary
Fixes a use-after-free when
curses.new_prescr()is followed byinitscr()ornewterm().The pending pre-screen is now tracked by the curses module and its ownership is transferred when the screen is adopted, preventing the
new_prescr()wrapper from deleting a liveSCREEN.Fixes issue gh-155875