Fix social nav color variable.

spearhead/assets/sass/_header.scss

@@ -135,7 +135,7 @@ $site-branding-height: 68px;
 
 			&:hover {
 				border-color: var(--primary-nav--color-border);
-				color: var(--social-nav--color-link-hover);
+				color: var(--primary-nav--color-link-hover);
 			}
 		}
 	}

spearhead/style-rtl.css

@@ -324,7 +324,7 @@ Tags: one-column, flexible-header, accessibility-ready, custom-colors, custom-me
 
 .site-header .social-navigation .menu-item > a:hover {
 	border-color: var(--primary-nav--color-border);
-	color: var(--social-nav--color-link-hover);
+	color: var(--primary-nav--color-link-hover);
 }
 
 .site-header div.menu-button-container button#primary-open-menu {

spearhead/style.css

@@ -324,7 +324,7 @@ Tags: one-column, flexible-header, accessibility-ready, custom-colors, custom-me
 
 .site-header .social-navigation .menu-item > a:hover {
 	border-color: var(--primary-nav--color-border);
-	color: var(--social-nav--color-link-hover);
+	color: var(--primary-nav--color-link-hover);
 }
 
 .site-header div.menu-button-container button#primary-open-menu {

spearhead/variables.css

@@ -69,6 +69,7 @@
 
 	--primary-nav--justify-content: flex-end;
 	--primary-nav--color-link: var(--global--color-secondary);
+	--primary-nav--color-link-hover: var(--global--color-primary);
 	--primary-nav--color-border: transparent;
 	--primary-nav--dropdown-color-link: var(--global--color-background);
 	--primary-nav--color-background: var(--global--color-foreground);