Alois Klink 720408e143 fix: define border2 for theme-base
`border2` is a theme variable used by the CSS for flowcharts and
user-journey.

I've defined this to default to `tertiaryBorderColor` in theme-base,
as other themes tend to set `border2` to the same value as
`clusterBorder`, which in theme-base is `tertiaryBorderColor`.
2023-04-13 07:32:18 +01:00
..