Not call MainSwitchBar.getSwitch()

This is private implement details, will be removed in future.

Should call MainSwitchBar's isChecked() and setChecked() to ensure
main switch bar's style is set correctly.

Bug: 306658427
Test: manual - on wifi tether
Test: manual - on developer options
Test: m RunSettingsRoboTests
Change-Id: I292ffbcf73da0721fc206e3dac7610a0aeb20047

src/com/android/settings/connecteddevice/audiosharing/AudioSharingSwitchBarController.java

@@ -33,13 +33,11 @@ public class AudioSharingSwitchBarController
 
     private final Context mContext;
     private final SettingsMainSwitchBar mSwitchBar;
-    private final Switch mSwitch;
 
     AudioSharingSwitchBarController(Context context, SettingsMainSwitchBar switchBar) {
         mContext = context;
         mSwitchBar = switchBar;
-        mSwitch = mSwitchBar.getSwitch();
-        mSwitch.setChecked(false);
+        mSwitchBar.setChecked(false);
     }
 
     @Override