fixed memory corruptions due to undoing the teco_machine_stringbuilding_t::codepage

* It's contained in teco_machine_main_t which is created per macro call frame.
  So after macro calls, the machine no longer exists.
  It is therefore unsafe to undo its members indiscriminately.
* On the other hand, we must undo the codepage setting when run interactively,
  so it is now only undone when belonging to the commandline macro frame.
* This was actually causing memory corruptions on every fnkeys cursor movement, but never
  caused crashes - probably because the invalid pointers are always pointing to unused
  parts of the C call stack.
* Initially broken in b31b8871.

0 files changed, 0 insertions, 0 deletions