#1704 choose faster options for testing batch study

[valentinsulzer]

Description

Change the options in the batch study test to make it faster

Time reduction: 87s -> 26s

Fixes #1704

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 #1762 (67db4e0) into develop (f2c36a1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1762   +/-   ##
========================================
  Coverage    99.28%   99.28%           
========================================
  Files          343      343           
  Lines        18900    18900           
========================================
  Hits         18765    18765           
  Misses         135      135           

Impacted Files	Coverage Δ
pybamm/models/standard_variables.py	100.00% <ø> (ø)

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[Saransh-cpp]

Thanks @tinosulzer! Not related to the code - there is a typo in the linked issue number, merging this might close the wrong one

[valentinsulzer]

thanks, fixed