Improve Twitch.tv clip tests

[pajlada]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

[codecov]

Codecov Report

Merging #283 (1ca4861) into master (a70c387) will increase coverage by 2.22%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #283      +/-   ##
==========================================
+ Coverage   32.10%   34.32%   +2.22%     
==========================================
  Files          56       56              
  Lines        1713     1707       -6     
==========================================
+ Hits          550      586      +36     
+ Misses       1130     1090      -40     
+ Partials       33       31       -2     

Impacted Files	Coverage Δ
internal/resolvers/twitch/clip_loader.go	92.30% <50.00%> (+30.08%)	⬆️
internal/resolvers/twitch/clip_resolver.go	100.00% <100.00%> (+43.90%)	⬆️
internal/resolvers/twitch/initialize.go	100.00% <100.00%> (+100.00%)	⬆️
internal/resolvers/twitch/parse_clip_slug.go	100.00% <0.00%> (+42.85%)	⬆️

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