Remove duplicate strings.

"Yes" and "no" were redefined many times with no clear benefit, so this
consolidates them into one definition.

Bug: 243843096
Test: Build, install, and open the Settings app
Test: atest SettingsRoboTests
Change-Id: I5f84d09f223efd478461ded93aeac82bf7b128d8

src/com/android/settings/notification/SpatialAudioParentPreferenceController.java

@@ -71,7 +71,7 @@ public class SpatialAudioParentPreferenceController extends BasePreferenceContro
             return mContext.getString(R.string.spatial_summary_on_one,
                     mContext.getString(R.string.spatial_audio_wired_headphones));
         } else {
-            return mContext.getString(R.string.spatial_summary_off);
+            return mContext.getString(R.string.off);
         }
     }
 }