lalinference_pipe_utils.py: minor fix in get_xml_psds

The previous one reads ifodata.data.data.data, which should be ifodata.data.data. I confirmed that with this patch we can successfully create dag with ignore-gracedb-psd=False. This bug was not found in the test runs with python3 since ndarray.data[i]=ndarray[i] in python3.

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LGTM

merged

mentioned in commit 53ce0323

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