Fix external towers discovery

[olistic]

No description provided.

[codecov-io]

Codecov Report

Merging #188 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
+ Coverage   92.24%   92.25%   +<.01%     
==========================================
  Files          85       85              
  Lines        1070     1071       +1     
  Branches      179      179              
==========================================
+ Hits          987      988       +1     
  Misses         68       68              
  Partials       15       15

Impacted Files	Coverage Δ
packages/warriorjs-cli/src/loadTowers.js	100% <100%> (ø)	⬆️

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