RF: Use CompositeTransform when assembling inverse composite transforms

[mgxd]

As this was fixed in ANTs 2.6.0+

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.23%. Comparing base (630786a) to head (64710ff).
⚠️ Report is 34 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #469      +/-   ##
==========================================
+ Coverage   57.14%   57.23%   +0.08%     
==========================================
  Files          72       72              
  Lines        6823     6811      -12     
  Branches      831      829       -2     
==========================================
- Hits         3899     3898       -1     
+ Misses       2715     2704      -11     
  Partials      209      209              

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