#851 fix scaling bug in current data

[rtimms]

Description

Fixes a bug where current data was being incorrectly scaled by the typical current

Fixes #851

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 #852 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #852      +/-   ##
==========================================
+ Coverage   98.24%   98.26%   +0.01%     
==========================================
  Files         180      180              
  Lines       10276    10358      +82     
==========================================
+ Hits        10096    10178      +82     
  Misses        180      180

Impacted Files	Coverage Δ
pybamm/parameters/parameter_values.py	100% <100%> (ø)	⬆️
...bamm/parameters/standard_parameters_lithium_ion.py	100% <0%> (ø)	⬆️

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[valentinsulzer]

oops, good catch