Update www/otter-browser to latest released version.

See https://github.com/OtterBrowser/otter-browser/releases/tag/v0.9.93 ,
only minor changes since last month's upstream release, but FreeBSD
is 10 months behind on otter releases.

Default options build both WebKit and WebEngine, which is possibly
a bit heavy.

PR: 224607
Submitted by: Dmitri Goutnik
Reported by: Dmitri Goutnik
Approved by: tcberner (mentor)