Fix case when a stream has traces with different sampling rates

Sentry Issue: WAVEQC-14

Exception: Can't merge traces with same ids but differing sampling rates!
  File "waveqc/tasks.py", line 206, in check_item
    result = check_removable_response(stream, channel, network, station, count)
  File "waveqc/tasks.py", line 164, in check_removable_response
    stream.merge(fill_value=0)

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