Updated defaults for core config options to match dummy data

[jacobcook1995]

Description

This PR just changes the default config options for the core module to match the dummy datasets we are using for the dummy module.

Type of change

• 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

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

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

[vgro]

LGTM :-)

[codecov-commenter]

Codecov Report

Merging #226 (151c1ce) into develop (5ca2055) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #226      +/-   ##
===========================================
+ Coverage    95.18%   95.41%   +0.23%     
===========================================
  Files           35       36       +1     
  Lines         1494     1549      +55     
===========================================
+ Hits          1422     1478      +56     
+ Misses          72       71       -1     

Impacted Files	Coverage Δ
...rtual_rainforest/models/abiotic_simple/__init__.py	100.00% <ø> (ø)
virtual_rainforest/core/data.py	88.60% <100.00%> (+0.44%)	⬆️
...rest/models/abiotic_simple/abiotic_simple_model.py	100.00% <100.00%> (+1.58%)	⬆️
...nforest/models/abiotic_simple/simple_regression.py	100.00% <100.00%> (ø)

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