VolumeControl: Fix volume for the activated device

For the newly activated device we should be passing volume index
rather than Le Audio volume level.

Bug: 243334827
Bug: 241501978
Tag: #feature
Test: tested manually
Change-Id: I8392120eef653f67b5ca91452847943b4cebb644
Merged-In: I8392120eef653f67b5ca91452847943b4cebb644
(cherry picked from commit f0e34592)