change outline color for contrast factor

Author: haschek

src/common/scss/_accessibility-defaults.scss

@@ -21,7 +21,7 @@
 */
 
 :root {
-    --#{$eccgui}-a11y-outline-color: #{$eccgui-color-primary};
+    --#{$eccgui}-a11y-outline-color: #{eccgui-color-var("layout", "magenta", "900")};
     --#{$eccgui}-a11y-outline-style: solid;
     --#{$eccgui}-a11y-outline-width: #{0.25 * $eccgui-size-block-whitespace};