Fixup for process_x in EnsemblePosterior

[michaeldeistler]

See @janfb's comment in #1138

we don't need the allow_iid check anymore?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.03%. Comparing base (f0aa0f9) to head (01ede16).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1148      +/-   ##
==========================================
- Coverage   85.09%   77.03%   -8.07%     
==========================================
  Files          90       90              
  Lines        6649     6649              
==========================================
- Hits         5658     5122     -536     
- Misses        991     1527     +536     

Flag	Coverage Δ
unittests	77.03% <0.00%> (-8.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
sbi/inference/posteriors/ensemble_posterior.py	53.53% <0.00%> (-33.34%)	⬇️

... and 22 files with indirect coverage changes

[janfb]

👍