use ["default"] instead of .default in legacy mode

[Rich-Harris]

fixes #1166

[codecov-io]

Codecov Report

Merging #1169 into master will increase coverage by 0.06%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master    #1169      +/-   ##
==========================================
+ Coverage   91.75%   91.82%   +0.06%     
==========================================
  Files         126      126              
  Lines        4563     4695     +132     
  Branches     1487     1568      +81     
==========================================
+ Hits         4187     4311     +124     
+ Misses        158      157       -1     
- Partials      218      227       +9

Impacted Files	Coverage Δ
src/generators/nodes/Slot.ts	89.83% <100%> (+0.17%)	⬆️
src/generators/nodes/Component.ts	93.99% <66.66%> (-1.23%)	⬇️
src/generators/dom/index.ts	97.18% <0%> (+0.96%)	⬆️

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