fix removal of gpus from base-instance-type agg filter

[bwagner5]

Issue #, if available:
N/A

Description of changes:

• base-instance-type should filter out gpu instance types if the instance-type passed in is not a gpu instance-type.

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[codecov-commenter]

Codecov Report

Merging #22 into master will decrease coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   90.04%   89.82%   -0.22%     
==========================================
  Files           8        8              
  Lines         874      875       +1     
==========================================
- Hits          787      786       -1     
- Misses         57       58       +1     
- Partials       30       31       +1     

Impacted Files	Coverage Δ
pkg/selector/aggregates.go	92.45% <100.00%> (+0.14%)	⬆️
pkg/selector/selector.go	84.36% <0.00%> (-0.95%)	⬇️

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[haugenj]

👍 👍