cppcheck: duplicateIf

- replace duplicate TIB_DROPDOWN test with TIB_DROPDOWN + TIB_DROPDOWNONLY
- consider also TIB_RADIOCHECK as AccessibleRole::TOGGLE_BUTTON

Change-Id: Id159349ae1515681f47c373ba3d839ed406284ab
Reviewed-on: https://gerrit.libreoffice.org/8164
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>