Fix typo ensamble

[berland]

Issue
Resolves a typo in the spelling of the word "ensemble".

Approach
sed

Pre review checklist

• Added appropriate labels

Adding labels helps the maintainers when writing release notes, see sections and the
corresponding labels here: https://github.com/equinor/ert/blob/main/.github/release.yml

[codecov-commenter]

Codecov Report

Merging #2845 (88b7a46) into main (e52240b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2845   +/-   ##
=======================================
  Coverage   65.20%   65.20%           
=======================================
  Files         653      653           
  Lines       53480    53480           
  Branches     4791     4791           
=======================================
  Hits        34874    34874           
+ Misses      17007    17005    -2     
- Partials     1599     1601    +2     

Impacted Files	Coverage Δ
ert_data/measured.py	87.37% <ø> (ø)
libres/lib/res_util/block_fs.cpp	53.82% <0.00%> (-0.30%)	⬇️
ert_gui/simulation/run_dialog.py	76.40% <0.00%> (+0.70%)	⬆️

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