Alias ` to Escape for the ipad hardware keyboard

Editor.js

@@ -175,6 +175,7 @@ class Editor extends List {
         return;
 
       case 'Escape':
+      case '`':
         if (!this.container_.parentElement.xArchObj) {
           for (let entry of this.queryEntries('.highlight')) {
             entry.getElement().classList.toggle('highlight', false);

List.js

@@ -125,6 +125,7 @@ class List {
       case 'Escape':
       case 'ArrowLeft':
       case 'h':
+      case '`':
         if (this.container_.parentElement.xArchObj) {
           this.container_.parentElement.focus();
         }