Markdown inline-code rendered incorrectly in tasklist.

[dodedodo]

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Describe the bug
Markdown's `inline code` function renders 2 times when used as part of a checkbox list (and is not rendered at all when there's no trailing character)

To Reproduce

Client details:

• OS: Linux
• Browser MS Edge (chromium) v93
• Nextcloud: 21
• Deck: 1.4.3

[stefan-niedermann]

Duplicate of #2109 (:mag: search terms markdown checkbox)