Fix IDA for callbacks that change p

[oscardssmith]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.
Requires SciML/DiffEqBase.jl#997 for tests to pass. Fixes #449

[ChrisRackauckas]

Test fails?

[oscardssmith]

yes. the test relies on your diffeqbase pr to make the reinit happen in the first place

[oscardssmith]

I believe tests should now pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ce4753f) 81.67% compared to head (3024c4a) 81.90%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #448      +/-   ##
==========================================
+ Coverage   81.67%   81.90%   +0.22%     
==========================================
  Files          11       11              
  Lines        1468     1470       +2     
==========================================
+ Hits         1199     1204       +5     
+ Misses        269      266       -3     

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