config: overwrite slices instead of merging

[InfernoJJ]

Previously it was causing issues with merging arrays where if the new array being merged wasn't bigger than the old one values would stick around. This hopefully fixes that

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.15 🎉

Comparison is base (24e3aee) 75.65% compared to head (ecf2f73) 75.80%.

❗ Current head ecf2f73 differs from pull request most recent head 5e510c0. Consider uploading reports for the commit 5e510c0 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
+ Coverage   75.65%   75.80%   +0.15%     
==========================================
  Files          28       28              
  Lines         920      926       +6     
==========================================
+ Hits          696      702       +6     
  Misses        178      178              
  Partials       46       46              

Impacted Files	Coverage Δ
config/config.go	76.74% <100.00%> (+3.77%)	⬆️

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