Adds metrics categories for gesture navigation dialogs

Bug: 135211145
Test: Builds
Change-Id: I9231778072bb222142fca09275cd84b87a263fa6

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

@@ -52,8 +52,7 @@ public class GestureNavigationBackSensitivityDialog extends InstrumentedDialogFr
 
     @Override
     public int getMetricsCategory() {
-        // TODO(135211145): Use a separate metrics category for this dialog.
-        return SettingsEnums.SETTINGS_GESTURE_SWIPE_UP;
+        return SettingsEnums.SETTINGS_GESTURE_NAV_BACK_SENSITIVITY_DLG;
     }
 
     @Override