vim-patch:9.1.0594: Unnecessary redraw when setting 'winfixbuf' (#29775)

Problem:  Unnecessary redraw when setting 'winfixbuf'.
Solution: Remove P_RWIN flag. (zeertzjq)

closes: vim/vim#15283

ac4ce9e15b
(cherry picked from commit bbe51ef016)

src/nvim/options.lua

@@ -9840,7 +9840,6 @@ return {
       ]=],
       full_name = 'winfixbuf',
       pv_name = 'p_wfb',
-      redraw = { 'current_window' },
       scope = { 'window' },
       short_desc = N_('pin a window to a specific buffer'),
       type = 'boolean',