Allow SettingsMainSwitchBars to be disabled

Test: manual, looking at notification settings
Fixes: 182859292
Change-Id: I06db2a0984b0dcbf71a69fc8f58e54b4670652a8

src/com/android/settings/widget/SettingsMainSwitchPreference.java

@@ -186,6 +186,7 @@ public class SettingsMainSwitchPreference extends TwoStatePreference {
      * Enable or disable the text and switch.
      */
     public void setSwitchBarEnabled(boolean enabled) {
+        setEnabled(enabled);
         if (mMainSwitchBar != null) {
             mMainSwitchBar.setEnabled(enabled);
         }