fix(events): avoid unnecessary CursorMoved (#24675)

Problem:    Temporarily changing current window in a script causes
            CursorMoved to be triggerd.
Solution:   Don't trigger CursorMoved if neither curwin nor cursor
            changed between two checks.

src/nvim/buffer_defs.h

@@ -1101,7 +1101,6 @@ struct window_S {
                                     ///< can be different from w_cursor.lnum
                                     ///< for closed folds.
   linenr_T w_last_cursorline;       ///< where last 'cursorline' was drawn
-  pos_T w_last_cursormoved;         ///< for CursorMoved event
 
   // the next seven are used to update the visual part
   char w_old_visual_mode;           ///< last known VIsual_mode