clang-tidy: fix cppcoreguidelines-prefer-member-initializer

[yperbasis]

and also cppcoreguidelines-macro-to-enum

[codecov]

Codecov Report

Attention: Patch coverage is 61.76471% with 26 lines in your changes missing coverage. Please review.

Project coverage is 53.52%. Comparing base (5756523) to head (6a40207).

Files	Patch %	Lines
silkworm/rpc/commands/ots_api.cpp	0.00%	10 Missing ⚠️
silkworm/rpc/commands/ots_api.hpp	0.00%	10 Missing ⚠️
silkworm/sync/messages/inbound_new_block.cpp	0.00%	3 Missing ⚠️
...ilkworm/sync/messages/inbound_new_block_hashes.cpp	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2191   +/-   ##
=======================================
  Coverage   53.52%   53.52%           
=======================================
  Files         687      687           
  Lines       47834    47838    +4     
  Branches     7253     7253           
=======================================
+ Hits        25603    25607    +4     
+ Misses      20005    20002    -3     
- Partials     2226     2229    +3     

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