Some fixes to run_test.sh:

* Add shebang
* chmod +x
* npx playwright install

Author: hoodmane

Tools/wasm/emscripten/browser_test/run_test.sh

@@ -1,3 +1,4 @@
+#!/bin/bash
 npm ci
-npx playwright install chrome
+npx playwright install
 CI=1 npx playwright test