Fix internal server error on checkboxes

[zeripath]

Annoyingly goldmarks SetAttributeString requires that
the value of the attribute is still a []byte but does
not make it clear in the documentation.

Fix #10842

Signed-off-by: Andrew Thornton [email protected]

[codecov-io]

Codecov Report

Merging #10845 into master will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #10845      +/-   ##
==========================================
+ Coverage   43.49%   43.51%   +0.01%     
==========================================
  Files         590      590              
  Lines       82806    82806              
==========================================
+ Hits        36020    36034      +14     
+ Misses      42308    42293      -15     
- Partials     4478     4479       +1     

Impacted Files	Coverage Δ
modules/markup/markdown/goldmark.go	64.95% <0.00%> (ø)
modules/queue/workerpool.go	55.87% <0.00%> (-1.07%)	⬇️
services/pull/pull.go	35.00% <0.00%> (-0.89%)	⬇️
modules/indexer/stats/db.go	50.00% <0.00%> (ø)
routers/repo/view.go	36.82% <0.00%> (+0.67%)	⬆️
models/notification.go	64.71% <0.00%> (+0.83%)	⬆️
modules/git/repo.go	47.70% <0.00%> (+0.91%)	⬆️
modules/log/event.go	65.64% <0.00%> (+1.02%)	⬆️
modules/log/file.go	77.62% <0.00%> (+2.09%)	⬆️
models/unit.go	44.44% <0.00%> (+2.46%)	⬆️
... and 1 more

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