UI: Fix non-standard string character in source

(Jim) For some reason a character outside of the standard ASCII
character set was used in this source file.  "Eight Spoked Asterisk",
Unicode character 0x02733.  Non-ASCII characters should probably not be
used directly in source files due to potential character encoding
issues that can occur depending on the operating system and compiler.

Closes jp9000/obs-studio#485
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f