Fixes around sendTransaction

[davidyuk]

This PR is supported by the Æternity Foundation

[codecov]

Codecov Report

Attention: Patch coverage is 89.55224% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 79.95%. Comparing base (a21bc1f) to head (d9cde12).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
src/send-transaction.ts	88.88%	1 Missing and 3 partials ⚠️
src/tx/builder/field-types/fee.ts	50.00%	0 Missing and 1 partial ⚠️
src/tx/builder/field-types/ttl.ts	50.00%	1 Missing ⚠️
src/tx/builder/index.ts	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1953      +/-   ##
===========================================
+ Coverage    79.91%   79.95%   +0.04%     
===========================================
  Files          101      102       +1     
  Lines         3450     3463      +13     
  Branches       733      735       +2     
===========================================
+ Hits          2757     2769      +12     
  Misses         381      381              
- Partials       312      313       +1     

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