Update encoder_processor_decoder.py

[gabrieloks]

There were recent changes in anemoi-models to introduce the remapper into anemoi-training ecmwf/anemoi-training#17. These changes introduced an additional level of indexing:

from model to internal_model and model

from data to internal_data and data

These changes were not taken into account in the bounding feature PR. In this PR, we fix this.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.84%. Comparing base (53dc8ed) to head (57841b6).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #53   +/-   ##
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  Coverage    99.84%   99.84%           
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  Files           23       23           
  Lines         1277     1277           
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  Hits          1275     1275           
  Misses           2        2           

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