Fix background of signed-commits on arc-green of timeline commits

[zeripath]

Fixes background of signed-commits block on arc-green of timeline commits

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To

Signed-off-by: Andrew Thornton art27@cantab.net

[codecov-commenter]

Codecov Report

Merging #12837 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #12837      +/-   ##
==========================================
- Coverage   43.17%   43.16%   -0.01%     
==========================================
  Files         654      654              
  Lines       72218    72218              
==========================================
- Hits        31177    31176       -1     
- Misses      35989    35991       +2     
+ Partials     5052     5051       -1     

Impacted Files	Coverage Δ
services/pull/pull.go	42.03% <100.00%> (ø)
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
modules/log/event.go	58.49% <0.00%> (-0.95%)	⬇️
services/pull/check.go	48.46% <0.00%> (+0.76%)	⬆️
models/repo_list.go	79.46% <0.00%> (+0.89%)	⬆️

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