🚨 Add a new key to each element in the beacon/device list

Without this change, we get an error

```
Warning: Each child in a list should have a unique "key" prop.

Check the render method of `BluetoothCardList`. See https://reactjs.org/link/warning-keys for more information.
BluetoothCard@ionic://localhost/dist/bundle.js:21253:18
BluetoothCardList@ionic://localhost/dist/bundle.js:21666:21
```

With this change, the error does not occur

www/js/bluetooth/BluetoothScanPage.tsx

@@ -176,7 +176,7 @@ const BluetoothScanPage = ({ ...props }: any) => {
         <div>
           {devices.map((device) => {
             if (device) {
-              return <BluetoothCard device={device} isClassic={isClassic} />;
+              return <BluetoothCard device={device} isClassic={isClassic} key={device.id} />;
             }
             return null;
           })}
@@ -188,7 +188,7 @@ const BluetoothScanPage = ({ ...props }: any) => {
       <div>
         {beaconsAsArray.map((beacon) => {
           if (beacon) {
-            return <BluetoothCard device={beacon} isScanningBLE={isScanningBLE} />;
+            return <BluetoothCard device={beacon} isScanningBLE={isScanningBLE} key={beacon.uuid} />;
           }
         })}
       </div>