Fix reference to OBS_VERT_TYPES_ALT

[thorbjoernl]

Change Summary

Fixes small issue with OBS_VERT_TYPES_ALT which is no longer on Colocator but ColocationSetup.

Related issue number

NA

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.58%. Comparing base (3bc258a) to head (eac30f2).
Report is 20 commits behind head on main-dev.

Files with missing lines	Patch %	Lines
pyaerocom/colocation/colocator.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1405   +/-   ##
=========================================
  Coverage     78.58%   78.58%           
=========================================
  Files           137      137           
  Lines         20899    20899           
=========================================
  Hits          16423    16423           
  Misses         4476     4476           

Flag	Coverage Δ
unittests	78.58% <0.00%> (ø)

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[lewisblake]

🙌