remove key size from total leaf size computation

[BeniaminDrasovean]

Reasoning behind the pull request

• Taking the key into consideration when computing data size is backwards incompatible

Proposed changes

• Revert some changes from previous PR

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (feat/balance-data-tries@d30b794). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@                    Coverage Diff                     @@
##             feat/balance-data-tries    #4729   +/-   ##
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  Coverage                           ?   70.74%           
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  Files                              ?      632           
  Lines                              ?    83536           
  Branches                           ?        0           
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  Hits                               ?    59096           
  Misses                             ?    20023           
  Partials                           ?     4417           

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