Remove svg preload

[silverwind]

It triggers a warning in the Chrome console about it being unused, so I think preloading of SVG assets may not be supported properly in current browsers. Remove it for now to avoid the warning.

[codecov-io]

Codecov Report

Merging #10654 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10654      +/-   ##
==========================================
+ Coverage   43.58%    43.6%   +0.01%     
==========================================
  Files         589      589              
  Lines       82561    82561              
==========================================
+ Hits        35988    36004      +16     
+ Misses      42112    42101      -11     
+ Partials     4461     4456       -5

Impacted Files	Coverage Δ
modules/indexer/stats/db.go	50% <0%> (-9.38%)	⬇️
models/unit.go	37.03% <0%> (-2.47%)	⬇️
routers/repo/view.go	36.14% <0%> (-0.68%)	⬇️
modules/log/file.go	77.62% <0%> (+2.09%)	⬆️
services/pull/temp_repo.go	31.62% <0%> (+2.56%)	⬆️
services/pull/patch.go	64.51% <0%> (+2.58%)	⬆️
modules/git/command.go	89.56% <0%> (+2.6%)	⬆️
modules/process/manager.go	78.31% <0%> (+3.61%)	⬆️
services/pull/check.go	55.48% <0%> (+5.48%)	⬆️

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