fix conversion factor for no3 to N

[heikoklein]

Change Summary

Conversion factor from ug N to ug for no3 is wrong (was same formula as hno3 )

Checklist

• [x] Start with a draft-PR
• [x] The PR title is a good summary of the changes
• [x] 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
• [x] Tests pass on CI
• [x] At least 1 reviewer is selected
• [x] Make PR ready to review

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.31%. Comparing base (0796175) to head (d87313a). Report is 2 commits behind head on main-dev.

Files	Patch %	Lines
pyaerocom/io/aux_components_fun.py	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main-dev #1214 +/- ## ========================================= Coverage 79.30% 79.31% ========================================= Files 131 131 Lines 20234 20232 -2 ========================================= Hits 16047 16047 + Misses 4187 4185 -2 ``` | [Flag](https://app.codecov.io/gh/metno/pyaerocom/pull/1214/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=metno) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/metno/pyaerocom/pull/1214/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=metno) | `79.31% <0.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=metno#carryforward-flags-in-the-pull-request-comment) to find out more.

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