FIX: only skip setting cf-attributes if both gain and offset are unused

[kmuehlbauer]

So this is unfortunate, as this slipped through the cracks. But anyway version numbers are cheap. 🤦‍♂️

[codecov]

Codecov Report

Merging #85 (59915eb) into main (cfae676) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   88.00%   87.97%   -0.04%     
==========================================
  Files          18       18              
  Lines        3227     3227              
==========================================
- Hits         2840     2839       -1     
- Misses        387      388       +1     

Flag	Coverage Δ
unittests	87.97% <100.00%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
xradar/io/backends/odim.py	88.13% <100.00%> (ø)
xradar/io/backends/iris.py	84.75% <0.00%> (-0.10%)	⬇️

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