Fixed bug causing "Unknown speaker!" in ami recipe

[alkazap]

Original Issue: https://github.com/flashlight/wav2letter/issues/976

closes #[976]

Summary

python prepare.py fails with AssertionError: Unknown speaker! FEE005

Test Plan (required)

Assertion error comes from utils.py line 117 assert speaker in speakers, f"Unknown speaker! {speaker}"

Judging by the assertion and line 119 speaker = speakers[speaker], the script expects speakers to be a dictionary, however, as we can see on line 111 speakers = {(speaker.id, speaker) for speaker in speakers}, speakers is a set of tuples.

Line 111 should be speakers = { speaker.id : speaker for speaker in speakers }, then the script works as intended.

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