leaudio: Fix unnecessary reconfiguration for Ringtone

When Volume Ring & Notification slider is used, then sample ringtone is
played along with metadata update.

If LeAudio is streaming and this point of time, BT stack might incorretly
interpret it as a need to reconfigure for the call.

Bug: 244683442
Test: atest BluetoothInstrumentationTests
Test: stream media and use the volume slider
Tag: #feature
Change-Id: I4a340ec0fd67960def5614926f7a3364ec6ed650