Chore: Mobile: Restore broken back button when file is shared

packages/app-mobile/components/screens/Note.tsx

@@ -139,6 +139,16 @@ class NoteScreenComponent extends BaseScreenComponent {
 			}
 
 			if (this.state.fromShare) {
+				// effectively the same as NAV_BACK but NAV_BACK causes undesired behaviour in this case:
+				// - share to Joplin from some other app
+				// - open Joplin and open any note
+				// - go back -- with NAV_BACK this causes the app to exit rather than just showing notes
+				this.props.dispatch({
+					type: 'NAV_GO',
+					routeName: 'Notes',
+					folderId: this.state.note.parent_id,
+				});
+
 				ShareExtension.close();
 				return true;
 			}