build(lint): remove clint.py rules for braces #20880

Uncrustify is the source of truth where possible.
Remove any redundant checks from clint.py.
See also https://github.com/neovim/neovim/pull/18563

src/nvim/buffer_defs.h

@@ -1404,7 +1404,9 @@ struct window_S {
 };
 
 /// Macros defined in Vim, but not in Neovim
+// uncrustify:off
 #define CHANGEDTICK(buf) \
   (=== Include buffer.h & use buf_(get|set|inc) _changedtick ===)
+// uncrustify:on
 
 #endif  // NVIM_BUFFER_DEFS_H