Domain Search: fix darker suggestion row dividers after components v37 bump (#113385)

The @wordpress/components 35 to 37 bump switched the base Divider to color its
line via the logical border-block-end/currentColor, which outranks Card's
physical border-color override. The row separators fell back to currentColor
(~rgb(128,128,128)) instead of the intended light divider.

Override the divider color with the --color-border-secondary token, matching
the sibling domains-table package's row dividers.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: bogiii

packages/domain-search/src/ui/domain-suggestions-list/style.scss

@@ -1,3 +1,4 @@
-.domain-suggestions-list__divider {
+hr.domain-suggestions-list__divider {
 	background: none;
+	border-color: var( --color-border-secondary );
 }