lint code: file `ExtractData_ClimateDownscaling.R` needs linting

[dschlaep]

Currently, the file ExtractData_ClimateDownscaling.R is excluded from linting, but should be linted and then included. See tests/testthat/test_rSFSW2_StyleSpelllingPractices.R:

  # Files that are not checked for lints
  files_not_tolint <- c(
    "ExtractData_ClimateDownscaling.R", # needs linting
    "Simulation_Run.R", # needs linting
    "OutputDatabase_Ensembles.R", # this is de-facto deprecated & defunct
    "RcppExports.R" # this is generated by Rcpp
  )