MidiDeviceService instantiation fails if there is <plugin> entry for sfizz-multi in aap_metadata.xml

[atsushieno]

By default, if we use aap_metadata.xml which was generated from aap-lv2-metadata-importer, MIDI device instantiation fails with the error:

02:44:21.417  1891-1913  JavaBinder      org...n.samples.aap_sfizz  E  *** Uncaught remote exception!  (Exceptions are not yet supported across processes.)
                                                                       java.lang.AssertionError: Assertion failed
                                                                       	at org.androidaudioplugin.midideviceservice.AudioPluginMidiDeviceService.getPluginId(AudioPluginMidiDeviceService.kt:22)
                                                                       	at org.androidaudioplugin.midideviceservice.AudioPluginMidiDeviceService.getPluginId$default(AudioPluginMidiDeviceService.kt:17)
                                                                       	at org.androidaudioplugin.midideviceservice.AudioPluginMidiReceiver.onDeviceOpened(AudioPluginMidiReceiver.kt:37)
                                                                       	at org.androidaudioplugin.midideviceservice.AudioPluginMidiDeviceService.onDeviceStatusChanged(AudioPluginMidiDeviceService.kt:59)
                                                                       	at android.media.midi.MidiDeviceService$1.onDeviceStatusChanged(MidiDeviceService.java:60)

It seems to be due to some failure in plugin resolution by pluginId (sfizz vs. sfizz-multi).