create initial data for dynamic components in correct place

[Rich-Harris]

fixes #1040

[codecov-io]

Codecov Report

Merging #1047 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1047   +/-   ##
=======================================
  Coverage   92.01%   92.01%           
=======================================
  Files         121      121           
  Lines        4368     4368           
  Branches     1408     1408           
=======================================
  Hits         4019     4019           
  Misses        148      148           
  Partials      201      201

Impacted Files	Coverage Δ
src/generators/nodes/Component.ts	94.93% <100%> (ø)	⬆️

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