fix: Wallet network switch detection (#70)

Author: valiafetisov

frontend/lib/wallets/MetaMask.ts

@@ -89,16 +89,16 @@ export default class MetaMask extends AbstractWallet {
         if (!(this.constructor as typeof MetaMask).isInterfaceReady) {
             return;
         }
-        window.ethereum.on('accountsChanged', this.accountsChangedHandler);
-        window.ethereum.on('chainChanged', this.networkChangedHandler);
+        window.ethereum.on('accountsChanged', this.accountsChangedHandler.bind(this));
+        window.ethereum.on('chainChanged', this.networkChangedHandler.bind(this));
     }
 
     public teardown() {
         if (!(this.constructor as typeof MetaMask).isInterfaceReady) {
             return;
         }
         window.$nuxt.$store.dispatch('network/setWalletChainId', undefined);
-        window.ethereum.removeListener('accountsChanged', this.accountsChangedHandler);
-        window.ethereum.removeListener('chainChanged', this.networkChangedHandler);
+        window.ethereum.removeListener('accountsChanged', this.accountsChangedHandler.bind(this));
+        window.ethereum.removeListener('chainChanged', this.networkChangedHandler.bind(this));
     }
 }