Block switch: ensure hover is reset when style changed (#12317)

When a block style is selected we should reset the hover state so that any component using this will be adjusted accordingly

packages/editor/src/components/block-styles/index.js

@@ -79,6 +79,7 @@ function BlockStyles( {
 	function updateClassName( style ) {
 		const updatedClassName = replaceActiveStyle( className, activeStyle, style );
 		onChangeClassName( updatedClassName );
+		onHoverClassName( null );
 		onSwitch();
 	}