Fix Rust wasm-gc test

[mvlabat]

Make the build green again :)

Why the test was red: with Rust 1.24 bundle size got larger for some reason, but it was still reasonably small (295 bytes vs 17961 bytes). I thought.. why don't we just compare not minified bundle against the minified one?

[codecov-io]

Codecov Report

Merging #862 into master will increase coverage by 5.97%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #862      +/-   ##
==========================================
+ Coverage   85.65%   91.63%   +5.97%     
==========================================
  Files          57       68      +11     
  Lines        1973     3311    +1338     
==========================================
+ Hits         1690     3034    +1344     
+ Misses        283      277       -6

Impacted Files	Coverage Δ
src/utils/installPackage.js	91.11% <0%> (-4.55%)	⬇️
src/utils/serializeObject.js	88.23% <0%> (-3.44%)	⬇️
src/assets/HTMLAsset.js	96.66% <0%> (-2.23%)	⬇️
src/transforms/postcss.js	93.18% <0%> (-1.56%)	⬇️
src/packagers/index.js	92.3% <0%> (-1.45%)	⬇️
src/assets/JSONAsset.js	92.3% <0%> (-1.45%)	⬇️
src/utils/getTargetEngines.js	98.73% <0%> (-1.27%)	⬇️
src/visitors/globals.js	96.15% <0%> (-0.91%)	⬇️
src/assets/TypeScriptAsset.js	100% <0%> (ø)	⬆️
src/assets/YAMLAsset.js	100% <0%> (ø)	⬆️
... and 44 more

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[devongovett]

Awesome, thanks! 🏆