Fix mobile social menu color bug.

spearhead/assets/sass/_header.scss

@@ -83,6 +83,10 @@ $site-branding-height: 68px;
 					color: var(--primary-nav--dropdown-color-link);
 				}
 			}
+
+			.social-navigation a {
+				color: var(--primary-nav--dropdown-color-link);
+			}
 		}
 
 		button#primary-close-menu {