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Adwaita: slightly increase contrast for treeview borders

- sligtly increase contrast for the treeview borders
- FIXME: High Contrast seems to drop the borders completely,
  there might be some trickery for using border-left-color and
  border-top-color this way as even forcing the color 'red' seems
  to render invisible on HC.

Fixes #2238
9 jobs for wip/jimmac/treeview-borders in 46 minutes and 46 seconds (queued for 1 second)
Status Job ID Name Coverage
  .Pre
passed #671994
style-check-diff

00:03:32

 
  Build
passed #671995
fedora-x86_64

00:13:09

passed #671997
win32
msys2-mingw32

00:05:28

passed #671996
release-build

00:11:49

 
  Analysis
passed #671998
static-scan

00:12:37

 
  Docs
passed #671999
reference

00:17:26

 
  Flatpak
manual #672000
flatpak allowed to fail manual
flatpak-manual:demo
manual #672002
flatpak allowed to fail manual
flatpak-manual:icon-browser
manual #672001
flatpak allowed to fail manual
flatpak-manual:widget-factory