Can just call focus instead of a wtr plugin

At some point the focus/enter key based unit test was failing in webkit.
I wrote the `focusPlugin` that used the playwright `focus` method which
I thought fixed my issue. I wanted to revisit the issue and in doing so
realized that it was in fact working as expected without the plugin.
Unsure what I was doing differently at first now.

.npmignore

@@ -2,7 +2,6 @@
 docs/
 examples/
 .editorconfig
-focusPlugin.js
 index.html
 rollup.config.js
 test.html

src/DarkPrefToggleElement.test.ts

@@ -2,7 +2,7 @@
 import { assert } from 'chai'
 import { DarkPref, DarkPrefUserSetting } from './DarkPref.js'
 import { DarkPrefToggleElement } from './DarkPrefToggleElement.js'
-import { sendMouse, resetMouse, sendKeys, executeServerCommand } from '@web/test-runner-commands'
+import { sendMouse, resetMouse, sendKeys } from '@web/test-runner-commands'
 
 const darkModeQuery = matchMedia('(prefers-color-scheme: dark)')
 const testDarkMode = darkModeQuery.matches
@@ -63,9 +63,14 @@ describe(`DarkPrefToggleElement (system: ${testDarkMode ? 'dark' : 'light'}, use
   })
 
   it('toggles DarkPref when focused and enter key is pressed', async function () {
-    await executeServerCommand('focus', '#default button')
+    const darkPrefToggle = document.getElementById('default') as DarkPrefToggleElement | null
+    const button = darkPrefToggle?.shadowRoot?.querySelector('button') as HTMLButtonElement | null
+    if (!button) { throw new Error('no button') }
+    button.focus()
     assert.strictEqual(DarkPref.current.isDark, (testUserPref ?? testDarkMode), 'initial dark pref matches user/system')
     await sendKeys({ press: 'Enter' })
-    assert.strictEqual(DarkPref.current.isDark, !(testUserPref ?? testDarkMode), 'dark pref was toggled')
+    assert.strictEqual(!DarkPref.current.isDark, (testUserPref ?? testDarkMode), 'dark pref was toggled')
+    await sendKeys({ press: 'Enter' })
+    assert.strictEqual(DarkPref.current.isDark, (testUserPref ?? testDarkMode), 'dark pref was toggled again')
   })
 })

web-test-runner.config.js

@@ -4,8 +4,6 @@ import { esbuildPlugin } from '@web/dev-server-esbuild'
 import { playwrightLauncher } from '@web/test-runner-playwright'
 import { defaultReporter, summaryReporter } from '@web/test-runner'
 
-import { focusPlugin } from './focusPlugin.js'
-
 const port = 8889
 
 // Setup `browsers` config so we test all permutations of product * colorScheme * stored user preference
@@ -54,7 +52,7 @@ export default {
     // use typescript esbuild loader for all js and ts files
     loaders: { '.js': 'ts', '.ts': 'ts' },
     tsconfig: fileURLToPath(new URL('./tsconfig.json', import.meta.url))
-  }), focusPlugin()],
+  })],
   port,
   reporters: [defaultReporter(), summaryReporter()],
   testRunnerHtml: (testFramework) => `