Fix gowitness host validation bug

[TheTechromancer]

Fixes #1139.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 92%. Comparing base (522a5c1) to head (27cdd05).
Report is 5 commits behind head on dev.

❗ Current head 27cdd05 differs from pull request most recent head e36c44e. Consider uploading reports for the commit e36c44e to get more accurate results

Files	Patch %	Lines
bbot/modules/gowitness.py	80%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #1140   +/-   ##
=====================================
- Coverage     93%     92%   -0%     
=====================================
  Files        308     308           
  Lines      19603   19609    +6     
=====================================
- Hits       18042   18033    -9     
- Misses      1561    1576   +15     

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