Fix issues reported by stylelint

Problem/Motivation

See pipelines

css/cloudflare_stream.icons.theme.css
 1:1  ✖  Delete "⏎"   prettier/prettier
 3:1  ✖  Delete "··"  prettier/prettier
2 problems (2 errors, 0 warnings)
1 source checked
 /builds/project/cloudflare_stream/web/modules/custom/cloudflare_stream/css/cloudflare_stream.icons.theme.css
2 errors found
 prettier/prettier: 2

Steps to reproduce

See pipelines

Proposed resolution

Fix

Remaining tasks

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User interface changes

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API changes

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Data model changes

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