Hack to fix duplicate text when hydrating

[lukechu10]

This fixes a bug where dynamic text nodes are the single child of parent would be inserted twice when hydrating on the client side.

Fixes #319

[codecov-commenter]

Codecov Report

Merging #321 (93a023e) into master (e64f95b) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
+ Coverage   73.30%   73.33%   +0.03%     
==========================================
  Files          38       38              
  Lines        5331     5337       +6     
==========================================
+ Hits         3908     3914       +6     
  Misses       1423     1423              

Impacted Files	Coverage Δ
packages/sycamore/src/utils/render.rs	58.49% <100.00%> (+0.96%)	⬆️

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