fix(threads): notifications using wrong colour

Author: hazzuk

res/css/_common.pcss

@@ -115,6 +115,7 @@ body {
     --cpd-color-bg-accent-pressed: var(--cpd-color-blue-1100) !important;
     --cpd-color-text-action-accent: var(--cpd-color-blue-900) !important;
     --cpd-color-icon-accent-primary: var(--cpd-color-blue-900) !important;
+    --cpd-color-icon-success-primary: var(--cpd-color-blue-900) !important;
     --cpd-color-icon-accent-tertiary: var(--cpd-color-blue-800) !important;
     --cpd-color-icon-on-solid-primary: var(--cpd-color-gray-1400) !important;
     /* e2e verification */