Correct test copilot instructions

Author: Tyriar

.github/copilot-instructions.md

@@ -22,10 +22,10 @@ npm run build && npm run esbuild # Build all TypeScript and bundle
 **Testing**:
 - Unit tests: `npm run test-unit` (Mocha)
 - Unit tests filtering to file: `npm run test-unit -- **/fileName.ts
-- Per-addon unit tests: `npm run test-unit addons/addon-image/out-esbuild/*.test.js`
+- Per-addon unit tests: `npm run test-unit -- addons/addon-image/out-esbuild/*.test.js`
 - Integration tests: `npm run test-integration` (Playwright across Chrome/Firefox/WebKit)
 - Integration tests by file: `npm run test-integration -- test/playwright/InputHandler.test.ts`. Never use grep to filter tests, it doesn't work
-- Integration tests by addon: `npm run test-integration --suite=addon-search`. Suites always follow the format `addon-<something>`
+- Integration tests by addon: `npm run test-integration -- --suite=addon-search`. Suites always follow the format `addon-<something>`
 - Lint changes: `npm run lint-changes` to lint only changed files, `npm run lint-changes-fix` to fix them
 
 ## Addon Development Pattern