Remove redundant guard

[Heliosmaster]

Remove distinction between clj and cljs as we're already in the clj branch

[codecov-io]

Codecov Report

Merging #97 (647456f) into master (743e9bc) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   79.13%   79.13%           
=======================================
  Files           4        4           
  Lines         369      369           
  Branches       17       17           
=======================================
  Hits          292      292           
  Misses         60       60           
  Partials       17       17           

Impacted Files	Coverage Δ
src/aero/core.cljc	74.47% <0.00%> (ø)

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