Fix ESLint VSCode configuration

The working directory of ESLint was not set directly, so ESLint warnings
did not show up in VSCode. This sets the working directory properly such
that ESLint warnings are shown in VSCode.

See: https://github.com/Microsoft/vscode-eslint#settings-options

.vscode/settings.json

@@ -30,10 +30,8 @@
     "typescript",
     "typescriptreact"
   ],
-  "eslint.options": {
-    // This is necessary so that eslint can properly resolve its plugins
-    "resolvePluginsRelativeTo": "./extensions/ql-vscode"
-  },
+  // This is necessary to ensure that ESLint can find the correct configuration files and plugins.
+  "eslint.workingDirectories": ["./extensions/ql-vscode"],
   "editor.formatOnSave": false,
   "typescript.preferences.quoteStyle": "single",
   "javascript.preferences.quoteStyle": "single",