Fix code block background colour

[aringenbach]

Fixes #6778

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[gileluard]

lgtm

[codecov]

Codecov Report

Base: 10.11% // Head: 5.81% // Decreases project coverage by -4.30% ⚠️

Coverage data is based on head (0e023ba) compared to base (9cbf5dc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6779      +/-   ##
===========================================
- Coverage    10.11%    5.81%   -4.31%     
===========================================
  Files         1498     1496       -2     
  Lines       150968   150945      -23     
  Branches     60957    60908      -49     
===========================================
- Hits         15272     8770    -6502     
- Misses      135143   141783    +6640     
+ Partials       553      392     -161     

Impacted Files	Coverage Δ
Riot/Utils/EventFormatter.m	10.02% <100.00%> (ø)
Riot/Categories/Character.swift	0.00% <0.00%> (-100.00%)	⬇️
...otSwiftUI/Modules/Common/Util/BorderModifier.swift	0.00% <0.00%> (-100.00%)	⬇️
...iftUI/Modules/Common/Avatar/Model/Avatarable.swift	0.00% <0.00%> (-100.00%)	⬇️
...iftUI/Modules/Common/Util/RoundedCornerShape.swift	0.00% <0.00%> (-100.00%)	⬇️
...odules/AnalyticsPrompt/AnalyticsPromptModels.swift	0.00% <0.00%> (-100.00%)	⬇️
...odules/Common/DependencyInjection/Injectable.swift	0.00% <0.00%> (-100.00%)	⬇️
...dules/Common/Theme/ThemeUsersColorsExtension.swift	0.00% <0.00%> (-100.00%)	⬇️
...dules/Common/ViewFrameReader/ViewFrameReader.swift	0.00% <0.00%> (-100.00%)	⬇️
...dules/UserSessions/Common/View/SeparatorLine.swift	0.00% <0.00%> (-100.00%)	⬇️
... and 243 more

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