Fix disaggregation scripts to be used with 67k input

[k4rst3ns]

🐦 Description of this PR 🐦

• Due to set name issues the disaggregation.R and the disaggregation_LUH2.R had to be adjusted to work with the new 'x.y.iso' naming. The fixes are not backward compatible, so most likely this version will not work with 59k input anymore.

🔧 Checklist for PR creator 🔧

• Label pull request from the label list.

  • Low risk: Simple bugfixes (missing files, updated documentation, typos) or changes in start or output scripts

• Self-review own code

  • No hard coded numbers and cluster/country/region names.
  • The new code doesn't contain declared but unused parameters or variables.
  • magpie4 R library has been updated accordingly and backwards compatible where necessary.
  • scenario_config.csv has been updated accordingly (important if default.cfg has been updated)

• Document changes

  • Add changes to CHANGELOG.md
  • Where relevant, put In-code documentation comments
  • Properly address updates in interfaces in the module documentations
  • run goxygen::goxygen() and verify the modified code is properly documented

• Perform test runs

• TO BE DONE: check once more that disaggregation and disaggregation_LUH2 is working

📉 Performance changes 📈

• no need for test runs

🚨 Checklist for reviewer 🚨

• PR is labeled correctly
• Code changes look reasonable
  • No hard coded numbers and cluster/country/region names.
  • No unnecessary increase in module interfaces
  • model behavior/performance is satisfactory.
• Changes are properly documented
  • CHANGELOG is updated correctly
  • Updates in interfaces have been properly addressed in the module documentations
  • In-code documentation looks appropriate
• content review done (at least 1)
• RSE review done (at least 1)

[flohump]

Looks good. Thanks for fixing!