correct types for webdisp_opts

[lewisblake]

Change Summary

title. noticed when running obs-only

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 2 lines in your changes missing coverage. Please review.

Project coverage is 78.46%. Comparing base (c972234) to head (5b69097).
Report is 4 commits behind head on main-dev.

Files with missing lines	Patch %	Lines
pyaerocom/aeroval/experiment_processor.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1498   +/-   ##
=========================================
  Coverage     78.46%   78.46%           
=========================================
  Files           139      139           
  Lines         21124    21124           
=========================================
  Hits          16575    16575           
  Misses         4549     4549           

Flag	Coverage Δ
unittests	78.46% <0.00%> (ø)

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[thorbjoernl]

🥘