[speakertest] Force canberra driver to PulseAudio
Otherwise setting the device index via ca_context_change_device doesn't work and the test sound plays on the wrong device BUG: 442781
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0bd635cf
Otherwise setting the device index via ca_context_change_device doesn't work and the test sound plays on the wrong device BUG: 442781
mentioned in commit d1f3a700
·mentioned in commit d1f3a700