Earlier discard of MULTISELECTABLE state (#18977)
Fixes #18961
Summary of the issue:
NVDA still announces multiselectable when it should be disabled.
Description of user facing changes:
No longer announce multiselect state.
Description of developer facing changes:
None
Description of development approach:
Ensure the state is always discarded when the config flag is disabled.
Testing strategy:
STR from #18961
