vim: Fix c when range ends in a multibyte character (#14139)

Release Notes:

- vim: Fixed `c <motion>` omitting trailing multibyte characters
([#13909](https://github.com/zed-industries/zed/issues/13909)).

crates/vim/src/motion.rs

@@ -890,7 +890,7 @@ impl Motion {
                 }
 
                 if inclusive && selection.end.column() < map.line_len(selection.end.row()) {
-                    *selection.end.column_mut() += 1;
+                    selection.end = movement::saturating_right(map, selection.end)
                 }
             }
             Some(selection.start..selection.end)