Hotfix to remove non-null assertion for WalletConnect instance (#6)

Part of [laconicd testnet validator enrollment](https://www.notion.so/laconicd-testnet-validator-enrollment-6fc1d3cafcc64fef8c5ed3affa27c675)

TODO:
- Refactor WalletConnect instance in laconic wallet to use state variables

Co-authored-by: Shreerang Kale <shreerangkale@gmail.com>
Reviewed-on: #6

src/screens/WalletConnect.tsx

@@ -23,7 +23,7 @@ export default function WalletConnect() {
   };
 
   useEffect(() => {
-    const sessions = web3wallet!.getActiveSessions();
+    const sessions = web3wallet?.getActiveSessions() || {};
     setActiveSessions(sessions);
   }, [setActiveSessions]);