Fix yara rule hostname generation bug

[liquidsec]

Fixes #1766

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (4a06dc9) to head (03d4e54).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/modules/internal/excavate.py	20%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #1768   +/-   ##
=====================================
- Coverage     93%     93%   -0%     
=====================================
  Files        344     344           
  Lines      26507   26507           
=====================================
- Hits       24440   24435    -5     
- Misses      2067    2072    +5     

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