Support caption second UI structure (3/n)

Removed unenable behovior when turn off Show captions.

Bug: 143502915
Test: Manual
Change-Id: Idb59172967872f4c8ba76e6cdcb83ba0a7faeadd

src/com/android/settings/accessibility/CaptionAppearanceFragment.java

@@ -111,14 +111,7 @@ public class CaptionAppearanceFragment extends SettingsPreferenceFragment
         refreshPreviewText();
     }
 
-    private void setPreferenceViewEnabled(boolean enabled) {
-        for (Preference preference : mPreferenceList) {
-            preference.setEnabled(enabled);
-        }
-    }
-
     private void refreshPreferenceViewEnabled(boolean enabled) {
-        setPreferenceViewEnabled(enabled);
         mPreviewText.setVisibility(enabled ? View.VISIBLE : View.INVISIBLE);
     }