1185 wrong index in ode seir model

[kilianvolmer]

Changes and Information

Please briefly list the changes (main added features, changed items, or corrected bugs) made:

• Fixed wrong index in model.h of ODE SEIR model
• Added test to test_odeseir.cpp that would have failed with the previous wrong index

If need be, add additional information and what the reviewer should look out for in particular:

Closes #1185 .

Merge Request - Guideline Checklist

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Checks by code author

• Every addressed issue is linked (use the "Closes #ISSUE" keyword below)
• New code adheres to coding guidelines
• No large data files have been added (files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
• Tests are added for new functionality and a local test run was successful (with and without OpenMP)
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Checks by code reviewer(s)

• Corresponding issue(s) is/are linked and addressed
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• No large data files added in the whole history of commits(files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.97%. Comparing base (8958e31) to head (79db64d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1186   +/-   ##
=======================================
  Coverage   96.97%   96.97%           
=======================================
  Files         148      148           
  Lines       13718    13718           
=======================================
  Hits        13303    13303           
  Misses        415      415           

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[HenrZu]

Thank you for findings this typo. Just one short comment. Then we can merge this :)

[HenrZu]

Thank you. One last comment :) Then we can merge this PR