leaudio: Fix for context type while VOIP

When the LocalSink is resumed when stream is already created,
the context logic would incorrecty changed metadata to LIVE.
This patch fixes that.

Bug: 302481144
Test: atest bluetooth_le_audio_client_test
Tag: #feature

Change-Id: I8025dcf388217303e6a4c315b03fdfd19278dbea