Update src/theme/icon.rs to add Svelte icon

[Marcos-Gamarra]

Add svelte icon

[muniu-bot]

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This pull-request has been approved by: Marcos-Gamarra

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[codecov-commenter]

Codecov Report

Merging #871 (788a092) into master (58a8723) will decrease coverage by 0.64%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master     #871      +/-   ##
==========================================
- Coverage   86.54%   85.91%   -0.64%     
==========================================
  Files          49       49              
  Lines        4840     4643     -197     
==========================================
- Hits         4189     3989     -200     
- Misses        651      654       +3     

Impacted Files	Coverage Δ
src/theme/icon.rs	100.00% <ø> (ø)

... and 12 files with indirect coverage changes

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