Dont make the handle ever visible.

The drag handle no longer overlaps the block content div,
so we can't render a placeholder in the handle itself.
We need to figure somethingelse out.

packages/editor/src/components/block-list/style.scss

@@ -32,20 +32,6 @@
 
 	> .editor-block-list__block-draggable-inner {
 		visibility: hidden;
-
-		// Use opacity to work in various editor styles.
-		background-color: $dark-opacity-light-200;
-		// background-color: red;
-
-		.is-dark-theme & {
-			background-color: $light-opacity-light-200;
-			// background-color: blue;
-		}
-	}
-
-	&.is-visible > .editor-block-list__block-draggable-inner {
-		visibility: visible;
-		// background-color: green;
 	}
 
 	cursor: move; // Fallback for IE/Edge < 14