append to the dom, not a document fragment, when updating each block in slot

[Rich-Harris]

fixes #927

[codecov-io]

Codecov Report

Merging #932 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #932   +/-   ##
=======================================
  Coverage   91.72%   91.72%           
=======================================
  Files         109      109           
  Lines        4001     4001           
  Branches     1283     1283           
=======================================
  Hits         3670     3670           
  Misses        148      148           
  Partials      183      183

Impacted Files	Coverage Δ
src/generators/dom/visitors/EachBlock.ts	100% <100%> (ø)	⬆️

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