Remove dead headers

[thejohnfreeman]

Remove a set of headers included by no files outside of the set.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.2%. Comparing base (4d7aed8) to head (63940f5). Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5081   +/-   ##
=======================================
  Coverage     76.1%   76.2%           
=======================================
  Files          760     760           
  Lines        61489   61489           
  Branches      8137    8115   -22     
=======================================
+ Hits         46809   46833   +24     
+ Misses       14680   14656   -24     

Files with missing lines	Coverage Δ
src/xrpld/peerfinder/detail/Logic.h	47.6% <ø> (ø)

... and 6 files with indirect coverage changes

[ximinez]

Would it be fair to say this PR is "trivial"?