Fix indent rule for ESLint 8 compat in tests

It is no longer "@typescript-eslint/indent" but just "indent" in ESLint
8.

Author: akurtakov

org.eclipse.wildwebdeveloper.tests/testProjects/eslint/.eslintrc

@@ -7,6 +7,6 @@
   ],
   "plugins": ["@typescript-eslint"],
   "rules": {
-    "@typescript-eslint/indent": "error"
+    "indent": "error"
   }
 }