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/gestures/AssistGestureSettingsPreferenceController.java

@@ -128,8 +128,7 @@ public class AssistGestureSettingsPreferenceController extends GesturePreference
         if (!mAssistOnly) {
             isEnabled = isEnabled || isSilenceGestureEnabled();
         }
-        return mContext.getText(
-                isEnabled ? R.string.gesture_setting_on : R.string.gesture_setting_off);
+        return mContext.getText(isEnabled ? R.string.on : R.string.off);
     }
 
     @Override

src/com/android/settings/gestures/GesturePreferenceController.java

@@ -60,8 +60,7 @@ public abstract class GesturePreferenceController extends TogglePreferenceContro
 
     @Override
     public CharSequence getSummary() {
-        return mContext.getText(
-                isChecked() ? R.string.gesture_setting_on : R.string.gesture_setting_off);
+        return mContext.getText(isChecked() ? R.string.on : R.string.off);
     }
 
     @Override

src/com/android/settings/gestures/OneHandedEnablePreferenceController.java

@@ -51,7 +51,7 @@ public class OneHandedEnablePreferenceController extends BasePreferenceControlle
     public CharSequence getSummary() {
         return mContext.getText(
                 OneHandedSettingsUtils.isOneHandedModeEnabled(mContext)
-                        ? R.string.gesture_setting_on : R.string.gesture_setting_off);
+                        ? R.string.on : R.string.off);
     }
 
     @Override

src/com/android/settings/gestures/PreventRingingParentPreferenceController.java

@@ -104,7 +104,7 @@ public class PreventRingingParentPreferenceController extends TogglePreferenceCo
                     break;
                 // VOLUME_HUSH_OFF
                 default:
-                    summary = mContext.getText(R.string.switch_off_text);
+                    summary = mContext.getText(R.string.off);
             }
             preference.setEnabled(true);
             mPreference.setSwitchEnabled(true);