Fix issues found in testing

Description

During deployment testing, we found a few issues. Here are:

• Fixing the formatting of slurm's --nice parameter, which expects an equals sign;
• Update the parsing of submitted slurm jobs to now handle several job IDs (we're safe: there will always be at least one calibration job and a report job);
• A nitpick fixing a mal-formatted string in the Jungfrau dark notebook.

How Has This Been Tested?

These were tested by submitting jobs via MyMDC and ensuring their state were updated and the notebooks correct.
The report is at /gpfs/exfel/d/cal_tst/caldb_store/xfel/reports_test/CALLAB/FXE_XAD_JF1M/dark/dark_900113_r9999_r9998_r9997_211020_131112.pdf

Relevant Documents (optional)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

Reviewers

@ahmedk @roscar