fix: imports

[glevco]

Motivation

There's an incorrect import preventing full node initialization.

Acceptance Criteria

• Fix import

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Merging #762 (7265310) into master (29d9ec3) will decrease coverage by 0.09%.
Report is 4 commits behind head on master.
The diff coverage is 87.83%.

@@            Coverage Diff             @@
##           master     #762      +/-   ##
==========================================
- Coverage   84.70%   84.62%   -0.09%     
==========================================
  Files         252      253       +1     
  Lines       21801    21822      +21     
  Branches     2954     2957       +3     
==========================================
- Hits        18467    18466       -1     
- Misses       2692     2708      +16     
- Partials      642      648       +6     

Files Changed	Coverage Δ
hathor/sysctl/protocol.py	79.01% <80.76%> (-5.31%)	⬇️
hathor/sysctl/runner.py	90.00% <90.00%> (ø)
hathor/conf/testnet.py	100.00% <100.00%> (ø)
hathor/sysctl/exception.py	100.00% <100.00%> (ø)
hathor/sysctl/factory.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes