CTA2075: Fix failing client side tests

The new API throws an exception instead of returning false when a codec
is added twice or removed without being registered first.

Adjusted the tests

Test: adb shell device_config put media_audio android.media.audio.loudness_configurator_api true
Test: atest LoudnessCodecConfiguratorTest
Bug: 314864585
Change-Id: Idb2bb4feebc84bd18be96074a441e808628aba78