Issue/fix fake forecasts

[peterdudfield]

Pull Request

Description

make sure fake forecasts and gsp yield have the correct the correct installed capacity Fixes #

How Has This Been Tested?

CI tests

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #121 (5757c5a) into main (a094474) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   98.36%   98.37%           
=======================================
  Files          20       20           
  Lines        1041     1047    +6     
=======================================
+ Hits         1024     1030    +6     
  Misses         17       17           

Impacted Files	Coverage Δ
nowcasting_datamodel/fake.py	100.00% <100.00%> (ø)
nowcasting_datamodel/read/read.py	97.56% <100.00%> (ø)

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