Rich Text: Ensure format toolbar manages its own dismissal

Previously only closed on esc when editing link, not adding new link

TODO: Consolidate editing state

Author: aduth

blocks/rich-text/format-toolbar/index.js

@@ -64,7 +64,7 @@ class FormatToolbar extends Component {
 
 	onKeyDown( event ) {
 		if ( event.keyCode === ESCAPE ) {
-			if ( this.state.isEditingLink ) {
+			if ( this.state.isEditingLink || this.state.isAddingLink ) {
 				event.stopPropagation();
 				this.dropLink();
 			}