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

• 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 79.31%. Comparing base (0796175) to head (d87313a).
Report is 472 commits behind head on main-dev.

Files with missing lines	Patch %	Lines
pyaerocom/io/aux_components_fun.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            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	Coverage Δ
unittests	79.31% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.