fix(xo-web/backup/restore): don't use UNSAFE_componentWillReceiveProps (#6364)

Introduced by 7d6e832226

`UNSAFE_componentWillReceiveProps` method was only introduced in React 16 but we
are using React 15
`.eslintrc`: ask eslint to check the React version so that it doesn't suggest to
change it to `UNSAFE_componentWillReceiveProps`

scripts/babel-eslintrc.js

@@ -30,4 +30,9 @@ module.exports = {
       },
     },
   ],
+  settings: {
+    react: {
+      version: 'detect',
+    },
+  },
 }