Upgrade Calculator Fabric to React Native 0.80.x dependencies

Co-authored-by: HariniMalothu17 <185761277+HariniMalothu17@users.noreply.github.com>

Author: Copilot

samples/Calculator/fabric/App.tsx

@@ -271,4 +271,4 @@ export default class App extends React.Component {
   }
 }
 
-AppRegistry.registerComponent('Bootstrap', () => Bootstrap);
+AppRegistry.registerComponent('Bootstrap', () => App);

samples/Calculator/fabric/README.md

@@ -2,7 +2,7 @@
 
 This sample showcases the usage of React Native for Windows to build a simple calculator that is hosted on the experimental [Fabric rendering system](https://github.com/microsoft/react-native-windows/issues/12042).
 
-Currently this samples targets RNW 0.79
+Currently this samples targets RNW 0.80
 
 ### Setup
 First, make sure you've met the [React Native Windows System Requirements](https://microsoft.github.io/react-native-windows/docs/rnw-dependencies).