spread on dynamic component

[Rich-Harris]

fixes #1307

[codecov-io]

Codecov Report

Merging #1308 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1308      +/-   ##
==========================================
+ Coverage    91.5%   91.51%   +<.01%     
==========================================
  Files         124      124              
  Lines        4416     4417       +1     
  Branches     1390     1390              
==========================================
+ Hits         4041     4042       +1     
  Misses        154      154              
  Partials      221      221

Impacted Files	Coverage Δ
src/generators/nodes/Component.ts	96.87% <100%> (+0.01%)	⬆️

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