Small fixes in oneD

[ischoegl]

Changes proposed in this pull request

• Fix bug in FlameBase.set_initial_guess
• Replace remaining hardcoded c_offset_U reference in Inlet1D::eval
• Consolidate code in StFlow::evalRightBoundary

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[ischoegl]

This is ready for a review. The failing tests are unrelated - see #1532

[codecov]

Codecov Report

Merging #1531 (1295b2b) into main (f89efe8) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1531      +/-   ##
==========================================
+ Coverage   70.50%   70.51%   +0.01%     
==========================================
  Files         376      376              
  Lines       59075    59075              
  Branches    21219    21219              
==========================================
+ Hits        41649    41656       +7     
+ Misses      14348    14341       -7     
  Partials     3078     3078              

Impacted Files	Coverage Δ
interfaces/cython/cantera/onedim.py	82.63% <100.00%> (ø)
src/oneD/Boundary1D.cpp	55.39% <100.00%> (ø)
src/oneD/StFlow.cpp	82.18% <100.00%> (ø)

... and 1 file with indirect coverage changes

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