Fix the encoding of the placeholder HTML for typst watch
#7108
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When running
typst watchfor the html target, a placeholder html will show up if a new error occurs.However, this placeholder html contains the non-ascii character
…, but does not specify<meta charset='utf-8'>.As a result, some browsers will guess the encoding, which could be wrong.
This PR fixes it.
Example: Firefox on my computer interprets it as windows-1252/latin1: