Removed extra fee buffer

[theeldermillenial]

Currently the code adds in the fee buffer twice.

pycardano/pycardano/txbuilder.py

Line 725 in 38c348d

if self.fee_buffer is not None:

pycardano/pycardano/txbuilder.py

Line 1121 in 38c348d

if self.fee_buffer is not None:

This PR removes the addition of the fee buffer from _add_change_and_fee rather than from _estimate_fee, since _estimate_fee is used in a validation check during the build step and removing it from _estimate_fee could lead to edge cases. Also, _estimate_fee is used during _add_change_and_fee.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.72%. Comparing base (b9829ee) to head (1e2293d).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #404      +/-   ##
==========================================
+ Coverage   85.67%   85.72%   +0.04%     
==========================================
  Files          32       32              
  Lines        4202     4202              
  Branches     1052     1051       -1     
==========================================
+ Hits         3600     3602       +2     
+ Misses        423      422       -1     
+ Partials      179      178       -1     

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