Arguments given in VarWebScaleAndColormap may not be going through pydantic

[lewisblake]

Describe the bug

There are two __init__ methods in this class. Only the second one is being used. This means that the pydantic checking is not being used. One way to test this is to try and give VarWebScaleAndColormap arguments which are not scale and colmap

• Pyaerocom version: 0.21.dev0
• Computing platform: All
• Configuration file (if applicable): NA
• Error message (if applicable): NA

Relevant PR: #1256

[lewisblake]

They aren't being passed correctly. Pydantic should've yelled at me:

from pyaerocom.aeroval.glob_defaults import VarWebScaleAndColormap
test = VarWebScaleAndColormap({"blah": {"blah": ["a", "b", "c"], "blub": ["d", "e", "f"]}})

[lewisblake]

@heikoklein just want to put this on your radar