Always declare spread levels

[Rich-Harris]

Fixes #1413

[codecov-io]

Codecov Report

Merging #1414 into master will decrease coverage by 0.03%.
The diff coverage is 90%.

@@            Coverage Diff             @@
##           master    #1414      +/-   ##
==========================================
- Coverage   91.21%   91.18%   -0.04%     
==========================================
  Files         122      122              
  Lines        4483     4490       +7     
  Branches     1383     1386       +3     
==========================================
+ Hits         4089     4094       +5     
  Misses        154      154              
- Partials      240      242       +2

Impacted Files	Coverage Δ
src/compile/nodes/Component.ts	94.49% <90%> (-0.71%)	⬇️

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