feat: make delete and backspace keys work the same as delete button

ts/components/conversation/SessionConversation.tsx

@@ -60,7 +60,8 @@ import { SessionSpinner } from '../basic/SessionSpinner';
 import { RightPanel, StyledRightPanelContainer } from './right-panel/RightPanel';
 
 const DEFAULT_JPEG_QUALITY = 0.85;
-
+import { deleteMessagesByIdForEveryone } from '../../interactions/conversations/unsendingInteractions';
+// tslint:disable: jsx-curly-spacing
 interface State {
   isDraggingFile: boolean;
 }
@@ -352,6 +353,12 @@ export class SessionConversation extends React.Component<Props, State> {
           if (selectionMode) {
             window.inboxStore?.dispatch(resetSelectedMessageIds());
           }
+	  break;
+        case 'Backspace':
+        case 'Delete':
+          if (selectionMode) {
+            void deleteMessagesByIdForEveryone(this.props.selectedMessages, this.props.selectedConversationKey);
+          }
           break;
         default:
       }