[Expressive design] Update MainSwitch in SettingsActivity.

Bug: 349681531
Flag: EXEMPT migration
Test: visual
Change-Id: I0dc55e2ced5ba4ce808e0b29a9b3b60549972637

src/com/android/settings/SettingsActivity.java

@@ -311,7 +311,10 @@ public class SettingsActivity extends SettingsBaseActivity
         }
 
         setContentView(R.layout.settings_main_prefs);
-        mMainSwitch = findViewById(R.id.switch_bar);
+
+        mMainSwitch = SettingsThemeHelper.isExpressiveTheme(this)
+                ? findViewById(R.id.expressive_switch_bar)
+                : findViewById(R.id.switch_bar);
         if (mMainSwitch != null) {
             mMainSwitch.setMetricsCategory(lookupMetricsCategory());
             mMainSwitch.setTranslationZ(findViewById(R.id.main_content).getTranslationZ() + 1);