message: [terminal] Capabilities: Fixes Setulc entry.
diff: @@ -345,7 +345,9 @@ namespace
  String{ Undefined, "Smulx"sv, "\033[4:%p1%dm"sv },
  // Set underscore color.
  - String{ Undefined, "Setulc"sv, "\033[58:2:%p1%{65536}%/%d:%p1%{256}%/%{255}%&%d:%p1%{255}%&%d%;m"sv },
  + String{ Undefined, "Setulc"sv, "\033[58:2::%p1%{65536}%/%d:%p1%{256}%/%{255}%&%d:%p1%{255}%&%d%;m"sv },
  + // NB: the following would work, too.
  + // String{ Undefined, "Setulc"sv, "\033[58:2::%p1%d:%p2%d:%p3%dm"sv },
  // }}}
  // RGB for the ncurses direct-color extension.
  