only update component props if they are dynamic

[Rich-Harris]

fixes #1394

[codecov-io]

Codecov Report

Merging #1401 into master will decrease coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1401      +/-   ##
=========================================
- Coverage   91.25%   91.2%   -0.06%     
=========================================
  Files         122     122              
  Lines        4485    4481       -4     
  Branches     1385    1382       -3     
=========================================
- Hits         4093    4087       -6     
  Misses        154     154              
- Partials      238     240       +2

Impacted Files	Coverage Δ
src/compile/nodes/Component.ts	95.19% <ø> (-0.46%)	⬇️
src/compile/nodes/Attribute.ts	86.02% <100%> (-0.76%)	⬇️

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