#1547 fix esoh model in pouch cell

[valentinsulzer]

Description

Fixes #1547

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #1548 (c42c309) into develop (bae3720) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1548   +/-   ##
========================================
  Coverage    98.28%   98.28%           
========================================
  Files          310      310           
  Lines        17401    17402    +1     
========================================
+ Hits         17102    17103    +1     
  Misses         299      299           

Impacted Files	Coverage Δ
pybamm/models/submodels/particle/base_particle.py	100.00% <ø> (ø)
.../submodels/active_material/base_active_material.py	100.00% <100.00%> (ø)
...lectrolyte_diffusion/base_electrolyte_diffusion.py	100.00% <100.00%> (ø)
pybamm/solvers/solution.py	100.00% <100.00%> (ø)

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[brosaplanella]

Looks good, thanks Tino!