fix: mixpanel email (#54)

lib/core/composables/mixpanel.ts

@@ -91,7 +91,7 @@ export function useMixpanel() {
         ui: 'dui3', // Not sure about this but we need to put something to distiguish some events, like "Send", "Receive", alternatively we can have "SendDUI3" not sure!
         // eslint-disable-next-line camelcase
         core_version: hostApp.connectorVersion,
-        email: lastEmail,
+        email: lastEmail.value,
         ...customProperties
       }