Added in the control data

[jmafoster1]

In the covasim vaccinating the elderly example, the supplied simulated_data.csv file only had the treatment data in. I have added the control data back in.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	29		0	0.97s
✅ PYTHON	pylint	29		0	4.79s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.61%. Comparing base (e09888a) to head (eeb04ad).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #273   +/-   ##
=======================================
  Coverage   95.61%   95.61%           
=======================================
  Files          22       22           
  Lines        1572     1572           
=======================================
  Hits         1503     1503           
  Misses         69       69           

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