Varia: Make text and background colors in cover block match the frontend

varia/sass/blocks/cover/_editor.scss

@@ -1,13 +1,14 @@
 .wp-block-cover,
 .wp-block-cover-image {
 
-	background-color: #{map-deep-get($config-global, "color", "foreground", "default")};
+	background-color: #{map-deep-get($config-cover, "color", "background")};
+	color: #{map-deep-get($config-cover, "color", "foreground")};
 	min-height: #{map-deep-get($config-cover, "height")};
 
 	.wp-block-cover__inner-container,
 	.wp-block-cover-image-text,
 	.wp-block-cover-text {
-		color: #{map-deep-get($config-global, "color", "background", "default")};
+		color: #{map-deep-get($config-cover, "color", "foreground")};
 
 		a {
 			color: currentColor;

varia/style-editor.css

@@ -283,7 +283,8 @@ object {
 
 .wp-block-cover,
 .wp-block-cover-image {
-	background-color: #444444;
+	background-color: black;
+	color: white;
 	min-height: 480px;
 	/* Treating H2 separately to account for legacy /core styles */
 }