Fix compilation error related to unicode in source code

[trexinc]

There was a raw \ufe0e in the code, changed it to the escaped format. Otherwise the compilation failed on my system.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you believe this is a mistake, please reply to this comment to keep it open. If there isn't one already, a PR to fix or at least reproduce the problem in a test case will always help us get back on track to tackle this.

[rnorth]

Ah, I finally understand this: the U+fe0e character was in the code but invisible as whitespace. That character in unicode serves the purpose of forcing the previous glyph to be rendered as text, not an emoji - it was presumably inserted automatically by our IDEs when the line was first authored.

I'm fine with this - I've not seen this ever be a problem in any environment, but am happy to merge.

Thanks @trexinc, and sorry for taking time to realise what this PR is about.