Fix oop suport for extension

[ErikQQY]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.02%. Comparing base (81cdf78) to head (ef7e98b).
Report is 28 commits behind head on master.

Files with missing lines	Patch %	Lines
ext/FractionalDiffEqFdeSolverExt.jl	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
+ Coverage   62.09%   63.02%   +0.92%     
==========================================
  Files          36       31       -5     
  Lines        4089     4016      -73     
==========================================
- Hits         2539     2531       -8     
+ Misses       1550     1485      -65     

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