RegexManager: Update old test to use shortest variant with same outcome
RegexManager: Update old test to use shortest variant with same outcome

`</><1>` has the same effect as just `<1>` because the `<1>` overwrites
the default style marker `</>`.

Both are fine but I prefer the shortest variant when the resulting style
is exactly the same.

der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat