Remove log for not changing feerate when it was equal

[G8XSU]

Log is not required in this case and creates unnecessary log lines at trace level.

Closes #2646

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (9de51f0) 89.09% compared to head (2ee554a) 88.95%.
Report is 2 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2651      +/-   ##
==========================================
- Coverage   89.09%   88.95%   -0.15%     
==========================================
  Files         112      112              
  Lines       86959    87159     +200     
  Branches    86959    87159     +200     
==========================================
+ Hits        77476    77528      +52     
- Misses       7255     7391     +136     
- Partials     2228     2240      +12     

Files	Coverage Δ
lightning/src/ln/channelmanager.rs	81.45% <66.66%> (-0.21%)	⬇️

... and 29 files with indirect coverage changes

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