[CrOS Settings] Fix OsResetPage tests when optimize_webui = false

The wrong browsePreload URL was added, so this CL fixes it.

Bug: 1106173
Change-Id: I66ffd98d2dd6abc70ffb4c5f6921d6757ebb2531
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2301123
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788907}

chrome/test/data/webui/settings/chromeos/os_settings_browsertest.js

@@ -1364,7 +1364,7 @@ TEST_F('OSSettingsInputMethodOptionsPageTest', 'AllJsTests', () => {
 var OSSettingsResetPageTest = class extends OSSettingsBrowserTest {
   /** @override */
   get browsePreload() {
-    return super.browsePreload + 'reset_page/reset_page.html';
+    return super.browsePreload + 'chromeos/os_reset_page/os_reset_page.html';
   }
 
   /** @override */