[AIDL CTS] Fix visualizer cts issue with AIDL effects

1. Mapping VISUALIZER_CMD_CAPTURE command correctly with handler
2. Capture silent data when inactive Visualizer receive capture command

Bug: 270155119
Test: enable aidl and
atest CtsMediaAudioTestCases:android.media.audio.cts.VisualizerTest

Change-Id: Ic37e4c7e0b66af662381a187064974d56e5cc48e