chore(gui-v2): add eslint rule to error unused vars

packages/nc-gui-v2/.eslintrc.js

@@ -2,6 +2,7 @@ const baseRules = {
   'vue/no-setup-props-destructure': 0,
   'no-console': 0,
   'antfu/if-newline': 0,
+  'no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
   'prettier/prettier': ['error', {}, { usePrettierrc: true }],
 }