remove whitespace around <:Window/>

[Rich-Harris]

fixes #943

[codecov-io]

Codecov Report

Merging #946 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #946      +/-   ##
==========================================
+ Coverage   91.72%   91.73%   +<.01%     
==========================================
  Files         109      109              
  Lines        4001     4005       +4     
  Branches     1283     1285       +2     
==========================================
+ Hits         3670     3674       +4     
  Misses        148      148              
  Partials      183      183

Impacted Files	Coverage Δ
src/generators/dom/visitors/Element/meta/Window.ts	77.04% <ø> (ø)	⬆️
src/generators/dom/preprocess.ts	97.44% <100%> (+0.05%)	⬆️

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