feat(windows): investigate why km_core_state_context_set_if_needed needs to be called before each keystroke.

When going through the `state_api.test.cpp` tests. I observed that the action_struct would have a delete action for the previous entered character when simulating the `S` `I` `l` key presses. Unless `km_core_state_context_set_if_needed` is called after each.
I found the cause to be in the normalize_nfc line [if(!km::core::actions_normalize(&cached_context, &app_context, this->_action_struct)) {](https://github.com/keymanapp/keyman/blob/29b12ba42e7d59ec30a9a41a119823b992334774/core/src/state.cpp#L143)
I just haven't had a chance to investigate why further why this is.