Also use the correct symbol for the return key (we were using another
similar arrow because this one was not available in DejaVu Sans).

Fixes #14034.

Note that build/jam/repositories/HaikuPorts ships an old version of the
Noto package that does not include the Symbols2 font. It should be
updated. Adding this to the pile of lagging behind packages, alongside
icu, mawk/gawk, and tnftp. Can anyone take care of it?