Fix linter script + use pragma once

[codecov[bot]]

Codecov Report

Merging #423 (b307f4d) into master (ddbc50f) will increase coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #423      +/-   ##
==========================================
+ Coverage   76.87%   76.91%   +0.03%     
==========================================
  Files         111      111              
  Lines        7897     7896       -1     
  Branches     1610     1610              
==========================================
+ Hits         6071     6073       +2     
  Misses       1269     1269              
+ Partials      557      554       -3     

Impacted Files	Coverage Δ
silkworm/silkrpc/commands/debug_api.hpp	100.00% <ø> (ø)
silkworm/silkrpc/commands/engine_api.hpp	100.00% <ø> (ø)
silkworm/silkrpc/commands/erigon_api.hpp	100.00% <ø> (ø)
silkworm/silkrpc/commands/eth_api.hpp	100.00% <ø> (ø)
silkworm/silkrpc/commands/net_api.hpp	100.00% <ø> (ø)
silkworm/silkrpc/commands/ots_api.hpp	0.00% <ø> (ø)
silkworm/silkrpc/commands/parity_api.hpp	100.00% <ø> (ø)
silkworm/silkrpc/commands/rpc_api.hpp	0.00% <ø> (ø)
silkworm/silkrpc/commands/trace_api.hpp	100.00% <ø> (ø)
silkworm/silkrpc/commands/txpool_api.hpp	0.00% <ø> (ø)
... and 50 more

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