Make a minor change in byeoru.scm

* scm/byeoru.scm
  - (byeoru-select-menu-or-symbol): a minor clean-up
Fix a bug in byeoru menu

* scm/byeoru.scm
  - call (byeoru-deactivate-candidate-selector) instead of
    (im-deactivate-candidate-selector) so that
    byeoru-context-cand-no and byeoru-context-menu-no are preserved
Merge changes to uim-byeoru including a bug fix