Fix payer account in 'protocolFee.FeeCharged' event.

[Neopallium]

changelog

modified logic

• Use the payer account in the protocolFee.FeeCharged event.

[codecov[bot]]

Codecov Report

Merging #1481 (a4807fd) into develop (1c53c22) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1481      +/-   ##
===========================================
+ Coverage    53.92%   53.94%   +0.02%     
===========================================
  Files          151      151              
  Lines        32890    32890              
===========================================
+ Hits         17735    17744       +9     
+ Misses       15155    15146       -9     

Impacted Files	Coverage Δ
pallets/protocol-fee/src/lib.rs	51.21% <100.00%> (ø)

... and 5 files with indirect coverage changes