Fix bug for file output if radiative_heat_loss is enabled

[ischoegl]

If applicable, fill in the issue number this pull request is fixing

Fixes #986

Checklist

• There is a clear use-case for this code change
• The commit message has a short title & references relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• The pull request is ready for review

[codecov]

Codecov Report

Merging #993 (a130314) into main (e70371a) will decrease coverage by 0.95%.
The diff coverage is n/a.

❗ Current head a130314 differs from pull request most recent head deffc7f. Consider uploading reports for the commit deffc7f to get more accurate results

@@            Coverage Diff             @@
##             main     #993      +/-   ##
==========================================
- Coverage   71.60%   70.64%   -0.96%     
==========================================
  Files         360      355       -5     
  Lines       45719    44311    -1408     
==========================================
- Hits        32736    31304    -1432     
- Misses      12983    13007      +24     

Impacted Files	Coverage Δ
include/cantera/transport/DustyGasTransport.h	0.00% <0.00%> (-33.34%)	⬇️
...clude/cantera/transport/HighPressureGasTransport.h	0.00% <0.00%> (-33.34%)	⬇️
include/cantera/thermo/MixtureFugacityTP.h	0.00% <0.00%> (-20.00%)	⬇️
include/cantera/thermo/VPStandardStateTP.h	50.00% <0.00%> (-16.67%)	⬇️
include/cantera/thermo/GibbsExcessVPSSTP.h	14.28% <0.00%> (-10.72%)	⬇️
include/cantera/transport/WaterTransport.h	50.00% <0.00%> (-10.00%)	⬇️
include/cantera/thermo/ConstCpPoly.h	66.66% <0.00%> (-8.34%)	⬇️
include/cantera/transport/TransportData.h	66.66% <0.00%> (-8.34%)	⬇️
test_problems/shared/fileLog.h	42.85% <0.00%> (-7.15%)	⬇️
include/cantera/zeroD/IdealGasReactor.h	50.00% <0.00%> (-7.15%)	⬇️
... and 204 more

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[speth]

Thanks. Looks good to me.