Fix top-level dynamics nodes with hydration

[lukechu10]

Fixes #319

[codecov]

Codecov Report

Merging #374 (9f89ce6) into master (8b2beb5) will increase coverage by 1.02%.
The diff coverage is 42.85%.

❗ Current head 9f89ce6 differs from pull request most recent head a3f50de. Consider uploading reports for the commit a3f50de to get more accurate results

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
+ Coverage   62.66%   63.68%   +1.02%     
==========================================
  Files          47       47              
  Lines        7658     7678      +20     
==========================================
+ Hits         4799     4890      +91     
+ Misses       2859     2788      -71     

Impacted Files	Coverage Δ
packages/sycamore/src/generic_node/hydrate_dom.rs	0.00% <0.00%> (ø)
packages/sycamore/src/builder.rs	24.39% <100.00%> (+24.39%)	⬆️

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