hold xrun until calibration is done

[CJ-Wright]

No description provided.

[codecov-io]

Codecov Report

Merging #539 into master will decrease coverage by 0.04%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
- Coverage    84.5%   84.46%   -0.05%     
==========================================
  Files          24       24              
  Lines        2601     2607       +6     
==========================================
+ Hits         2198     2202       +4     
- Misses        403      405       +2

Impacted Files	Coverage Δ
xpdacq/tests/test_run_calib.py	100% <100%> (ø)	⬆️
xpdacq/calib.py	89.04% <66.66%> (-2.01%)	⬇️

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